1. Medical and Surgical Research Center University of Cartagena Cartagena Colombia
2. Medical and Surgical Research Center Fundación Universitaria Autónoma de las Américas Pereira Colombia
3. Department of Surgery University of Cartagena Cartagena Colombia
4. Department of Medicine Fundación Universitaria San Martin Sabaneta Colombia
5. Department of Anesthesiology Universidad Industrial de Santander Bucaramanga Colombia
6. Department of Medicine Universidad de Antioquia Medellin Colombia