About the Authors

Ivan Solà

Affiliations Iberoamerican Cochrane Centre - Clinical Epidemiology and Public Health Department, Biomedical Research Institute Sant Pau (IIB Sant Pau), Barcelona, Spain, CIBER de Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain

José Miguel Carrasco

Affiliation University of Navarra, Institute for Culture and Society, Pamplona, Spain

Petra Díaz del Campo

Affiliation Scientific Committee of Guíasalud - National Clinical Practice Guideline Programme of the NHS, Madrid, Spain

Javier Gracia

Affiliation Scientific Committee of Guíasalud - National Clinical Practice Guideline Programme of the NHS, Madrid, Spain

Carola Orrego

Affiliations Avedis Donabedian Research Institute (FAD), Barcelona, Spain, Universitat Autònoma de Barcelona, Barcelona, Spain, Red de investigación en servicios de salud en enfermedades crónicas (REDISSEC), Barcelona, Spain

Flora Martínez

Affiliation General Secretariat of Public Health, Social Inclusion and Quality of Life, Andalusian Regional Ministry of Health and Social Well-being, Seville, Spain

Anna Kotzeva

Affiliation Agency for Health Quality and Assessment of Catalonia (AQuAS), Barcelona, Spain

Imma Guillamón

Affiliation Agency for Health Quality and Assessment of Catalonia (AQuAS), Barcelona, Spain

Enrique Calderón

Affiliation Instituto de Biomedicina de Sevilla, Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, Seville, Spain

Idoia de Gaminde

Affiliations Scientific Committee of Guíasalud - National Clinical Practice Guideline Programme of the NHS, Madrid, Spain, Servicio de Docencia y Desarrollo Sanitarios, Departamento de Salud Gobierno de Navarra, Spain

Arturo Louro

Affiliation Centro de Saúde de Cambre. Xerencia de Atención Primaria A Coruña – SERGAS –, A Coruña, Spain

Rafael Rotaeche

Affiliations Scientific Committee of Guíasalud - National Clinical Practice Guideline Programme of the NHS, Madrid, Spain, Grupo Kronikgune sobre gestión del conocimiento, Centro de Salud de Alza, Donostia-San Sebastián, Spain

Flavia Salcedo

Affiliations Scientific Committee of Guíasalud - National Clinical Practice Guideline Programme of the NHS, Madrid, Spain, Instituto Aragonés de Ciencias de la Salud, Zaragoza, Spain

Paola Velázquez

Affiliation Iberoamerican Cochrane Centre - Clinical Epidemiology and Public Health Department, Biomedical Research Institute Sant Pau (IIB Sant Pau), Barcelona, Spain

Pablo Alonso-Coello

palonso@santpau.cat

Affiliations Iberoamerican Cochrane Centre - Clinical Epidemiology and Public Health Department, Biomedical Research Institute Sant Pau (IIB Sant Pau), Barcelona, Spain, CIBER de Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain, Scientific Committee of Guíasalud - National Clinical Practice Guideline Programme of the NHS, Madrid, Spain

Competing Interests

The other authors have declared that no competing interests exist. Pablo Alonso-Coello and Ivan Solà are members of the GRADE working group. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: IS PAC. Performed the experiments: IS JMC PDC JC CO FM AK IG EC IdG AL RR FS PV PAC. Analyzed the data: IS JMC. Wrote the paper: IS JMC. Designed the study and organized the groups: IS JMC PDC JC CO FM AK IG EC IdG AL RR FS PV PAC. Organized and ran the groups: IS JMC PAC PDC JG FM EC CO. Provided substantial feed-back and accepted the final version of the manuscript: IS JMC PDC JC CO FM AK IG EC IdG AL RR FS PV PAC.