1 Iberoamerican Cochrane Center, Biomedical Research Institute Sant Pau (IIB Sant Pau-CIBERESP), Barcelona, Spain; Department of Clinical Epidemiology & Biostatistics, McMaster University, Hamilton, Ontario, Canada.
2 Iberoamerican Cochrane Center, Biomedical Research Institute Sant Pau (IIB Sant Pau-CIBERESP), Barcelona, Spain.
3 Department of Clinical Epidemiology & Biostatistics, McMaster University, Hamilton, Ontario, Canada; Evidence Based Dentistry Unit, Faculty of Dentistry, University of Chile, Santiago, Chile.
4 Norwegian Knowledge Centre for the Health Services, Oslo, Norway.
5 Department of Clinical Epidemiology & Biostatistics, McMaster University, Hamilton, Ontario, Canada.