1. Research Unit Department, Hospital Universitario de Canarias, Tenerife, Spain
2. Nephrology Department, Hospital Universitario de Canarias, Tenerife, Spain
3. Gastroenterology Department, Hospital Universitario de Canarias, Tenerife, Spain
4. Oncology Department, Hospital Universitario de Canarias, Tenerife, Spain
5. Cardiology Department, Hospital Universitario de Canarias, Tenerife, Spain
6. Gastroenterology Department, Hospital Universitario Nuestra Señora de Candelaria, Tenerife, Spain
7. Endocrinology Department, Hospital Universitario de Canarias, Tenerife, Spain
8. Department of Clinical Biochemistry, Hospital Universitario Marqués de Valdecilla, Santander, Spain
9. Central Laboratory, Hospital Universitario de Canarias, Tenerife, Spain
10. Internal Medicine Department, Universidad de La Laguna, Tenerife, Spain