1. School of Medicine; Instituto Universitario Hospital Italiano de Buenos Aires; Buenos Aires Argentina
2. School of Medicine; Universidad de Valparaíso; Viña del Mar Chile
3. Department of Psychiatry; Universidad de Valparaíso; Valparaíso Chile
4. Department of Medical Specialties; Universidad de Valparaíso; Viña del Mar Chile
5. Department of Surgery; Universidad de Valencia; Valencia Spain
6. Institute of General Practice; Medical Faculty of the Heinrich-Heine-University Düsseldorf; Düsseldorf Germany