1. Department of Epidemiology, Milken Institute School of Public Health, The George Washington University, Washington, District of Columbia, USA.
2. Latin American Network for Cancer Research (LAN–CANCER), Lima, Peru.
3. Escuela Profesional de Medicina Humana, Universidad Privada San Juan Bautista, Filial Chincha, Ica, Peru.
4. Escuela Profesional de Medicina Humana, Universidad Privada San Juan Bautista, Chorrillos, Lima, Peru.
5. Department of Medical Oncology, Instituto Nacional de Enfermedades Neoplasicas, Lima, Peru.
6. Universidad Cientifica del Sur, Lima, Peru.
7. Department of Surgery, University of Massachusetts, Worcester, Massachusetts, USA.