1. Research Department; Instituto Universitario Hospital Italiano de Buenos Aires; Buenos Aires Argentina
2. Central Library; Instituto Universitario Hospital Italiano de Buenos Aires; Buenos Aires Argentina
3. Iberoamerican Cochrane Centre, Biomedical Research Institute Sant Pau (IIB Sant Pau); CIBER Epidemiología y Salud Pública (CIBERESP); Barcelona Spain
4. Institute of General Practice; Medical Faculty of the Heinrich-Heine-University Düsseldorf; Düsseldorf Germany