1. Department of Clinical Research, Instituto Nacional De Cancerología, Mexico City, Mexico
2. Department of Medical Oncology, Instituto Nacional De Cancerología, Mexico City, Mexico
3. Department of Medical Oncology, Centro Médico ABC, Mexico City, Mexico
4. Department of Medical Oncology, Centro Estatal De Oncología Campeche INDESALUD, Campeche, Mexico
5. Department of Surgical Oncology, Centro Estatal De Oncología Campeche INDESALUD, Campeche, Mexico
6. Oncology Hospital, Centro Médico Siglo XXI, Instituto Mexicano Del Seguro Social (IMSS), Mexico City, Mexico
7. Department of Oncology, UMAE Hospital Ginecoobstetricia, Centro Médico Nacional De Occidente, Instituto Mexicano Del Seguro Social (IMSS), Guadalajara, Jalisco, Mexico
8. Instituto Nacional De Cancerología, Mexico City, Mexico