1. Staff Surgeon, Centro de Cirugías Especiales, Bahía Blanca, Argentina.
2. Staff Surgeon, Centro de Atención para Enfermedades Metabólicas y Obesidad, Coahuila, Mexico.
3. Staff Surgeon, Centro de Cirugía Laparoscópica de Avanzada, Santiago de los Caballeros, Dominican Republic.
4. Director of the Center of Excellence for the Study and Treatment of Obesity and Diabetes, Mexico City, Mexico.
5. Director of the Center of Excellence for the Study and Treatment of Obesity and Diabetes, Valladolid, Spain.