1. Iberoamerican Cochrane Centre Barcelona, Biomedical Research Institute San Pau (IIB Sant Pau), and Department of Paediatrics, Obstetrics, Gynaecology and Preventive Medicine, Universidad Auto` noma de Barcelona, Barcelona, Spain (C.V.)
2. Iberoamerican Cochrane Centre Barcelona, Biomedical Research Institute San Pau (IIB Sant Pau), Barcelona, Spain (M.R.)
3. McMaster University, Hamilton, Ontario, and Dalhousie University, Halifax, Nova Scotia, Canada (B.C.J.)
4. Wageningen University, Wageningen, the Netherlands (R.K.)
5. Jagiellonian University Medical College, Krakow, Poland (A.P., J.Z., D.S., M.M.B.)
6. Medical University of Warsaw, Warsaw, and Jagiellonian University Medical College, Krakow, Poland (M.S.)
7. Iberoamerican Cochrane Centre Barcelona, Biomedical Research Institute San Pau (IIB Sant Pau), and CIBER de Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain (I.S.)
8. McMaster University, Hamilton, Ontario, Canada (D.Z., G.H.G.)
9. School of Medicine, Chosun University, Gwangju, Republic of Korea (M.A.H.)
10. Dalhousie University, Halifax, Nova Scotia, Canada, and Netherlands Comprehensive Cancer Organisation (IKNL), Utrecht, the Netherlands (R.W.V.)
11. Iberoamerican Cochrane Centre Barcelona, Biomedical Research Institute San Pau (IIB Sant Pau), and CIBER de Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain, and McMaster University, Hamilton, Ontario, Canada (P.A.)