1. Center of Excellence for the Surgical Treatment of Morbid Obesity; Hospital Oswaldo Cruz; São Paulo São Paulo Brazil
2. Department of Experimental Pathology; UCD Conway Institute, School of Medicine and Medical Sciences; University College Dublin; Ireland
3. Department of Gastrosurgical Research and Education; Sahlgrenska Academy; University of Gothenburg; Sweden MT USA
4. Billings Clinic; Billings MT USA