1. Research Department Cochrane Associate Centre, Instituto Universitario Hospital Italiano de Buenos Aires Buenos Aires Argentina
2. Medicine School University of Valparaíso, Associated Cochrane Centre Valparaíso Chile
3. Interdisciplinary Centre for Health Studies (CIESAL) Cochrane Associate Centre, School of Medicine, Universidad de Valparaíso Valparaíso Chile
4. Institute of General Practice Medical Faculty of the Heinrich‐Heine‐University Düsseldorf Düsseldorf Germany