| CC Attribuzione - Condividi allo stesso modo 4.0 Internazionale | OPENAIRE |
| CC BY | OPENAIRE |
| CC-BY-1.0 | OPENAIRE |
| CC-BY-2.5 | OPENAIRE |
| CC-BY-4.0 | OPENAIRE |
| Creative Commons Attribution 4.0 | OPENAIRE |
| Creative Commons Attribution 4.0 International (CC BY 4.0) | OPENAIRE |
| Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. | OPENAIRE |
| Reconocimiento: http://creativecommons.org/licenses/by/3.0/deed.es | OPENAIRE |
| This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. | OPENAIRE |
| cc-by | OPENAIRE |
| cc_by | OPENAIRE |
| http://creativecommons.org/licenses/BY/4.0 | OPENAIRE |
| http://creativecommons.org/licenses/by/ | OPENAIRE |
| http://creativecommons.org/licenses/by/1.0/legalcode | OPENAIRE |
| http://creativecommons.org/licenses/by/2.0 | OPENAIRE |
| http://creativecommons.org/licenses/by/2.0/ | OPENAIRE |
| http://creativecommons.org/licenses/by/2.0/uk/ | OPENAIRE |
| http://creativecommons.org/licenses/by/2.0/uk/legalcode | OPENAIRE |
| http://creativecommons.org/licenses/by/2.5 | OPENAIRE |
| http://creativecommons.org/licenses/by/2.5/ | OPENAIRE |
| http://creativecommons.org/licenses/by/2.5/ar | OPENAIRE |
| http://creativecommons.org/licenses/by/2.5/ar/ | OPENAIRE |
| http://creativecommons.org/licenses/by/2.5/pe/ | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0 | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/ | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/at/ | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/br/ | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/de | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/de/ | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/de/legalcode | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/deed.en_US | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/es | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/es/ | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/igo | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/igo/ | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/it/ | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/legalcode | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/nz | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/nz/ | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/pl/ | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/us | OPENAIRE |
| http://creativecommons.org/licenses/by/3.0/us/ | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0 | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/ | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/ (http://creativecommons.org/licenses/by/4.0/) ). | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (http://creativecommons.org/licenses/by/4.0/) . | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (http://creativecommons.org/licenses/by/4.0/) . | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (http://creativecommons.org/licenses/by/4.0/) . The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/ (http://creativecommons.org/publicdomain/zero/1.0/) ) applies to the data made available in this article, unless otherwise stated in a credit line to the data. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This article is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use and redistribution provided that the original author and source are credited. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material.If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is a publication of the U.S. Government. This publication is in the public domain and is therefore without copyright. All text from this work may be reprinted freely. Use of these materials should be properly cited. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/ (http://creativecommons.org/licenses/by/4.0/) ), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/ (http://creativecommons.org/licenses/by/4.0/) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the Creative Commons Attribution License 4.0 (CCBY) (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the CC-BY License. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License CC-BY 4.0., which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license (http://creativecommons.org/licenses/by/4.0/) . | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) (http://creativecommons.org/licenses/by/4.0/) . The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/This work is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/) , which allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, so long as attribution is given to the creator. The license allows for commercial use. | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/deed.ca | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/deed.de | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/deed.en_US | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/deed.es | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/deed.no | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/deed.sl | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/legalcode | OPENAIRE |
| http://dcat-ap.de/def/licenses/cc-by | OPENAIRE |
| http://dcat-ap.de/def/licenses/cc-by-de/3.0 | OPENAIRE |
| http://dcat-ap.de/def/licenses/cc-by/4.0 | OPENAIRE |
| http://politica.dk/ | OPENAIRE |
| http://spdx.org/licenses/CC-BY-1.0.html#licenseText | OPENAIRE |
| http://spdx.org/licenses/CC-BY-2.0.html#licenseText | OPENAIRE |
| http://spdx.org/licenses/CC-BY-2.5.html#licenseText | OPENAIRE |
| http://spdx.org/licenses/CC-BY-3.0.html#licenseText | OPENAIRE |
| http://spdx.org/licenses/CC-BY-4.0.html#licenseText | OPENAIRE |
| http://www.opendefinition.org/licenses/CC BY | OPENAIRE |
| http://www.opendefinition.org/licenses/cc-by | OPENAIRE |
| https://creativecommons.org/licenses//by/4.0 | OPENAIRE |
| https://creativecommons.org/licenses/by/1.0/legalcode | OPENAIRE |
| https://creativecommons.org/licenses/by/2.0 | OPENAIRE |
| https://creativecommons.org/licenses/by/2.0/ | OPENAIRE |
| https://creativecommons.org/licenses/by/2.0/legalcode | OPENAIRE |
| https://creativecommons.org/licenses/by/2.5/ar/ | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0 | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0/ | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0/de | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0/de/ | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0/de/deed.de | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0/de/legalcode | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0/deed.de | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0/es/ | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0/ie/ | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0/it/ | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0/legalcode | OPENAIRE |
| https://creativecommons.org/licenses/by/3.0/pl/ | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0 | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0/ | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0/deed | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0/deed.ca | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0/deed.de | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0/deed.en | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0/deed.es | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0/deed.it | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0/deed.pt_BR | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0/legalcode | OPENAIRE |
| https://creativecommons.org/licenses/by/4.0/legalcode.de | OPENAIRE |
| http://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (http://creativecommons.org/licenses/by/4.0/) .http://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (http://creativecommons.org/licenses/by/4.0/) . | OPENAIRE |