Department of Endocrinology and Nutrition, Complejo Hospitalario Universitario Insular-Materno Infantil, 35016 Gran Canaria, Spain. Instituto Universitario de Investigaciones Biomédicas y Sanitarias, Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, 35001 Las Palmas, Spain. Department of Rehabilitation and Physical Medicine, Complejo Hospitalario Universitario Insular-Materno Infantil, 35016 Gran Canaria, Spain. Internal Medicine Nursing 8th North Wing, Complejo Hospitalario Universitario Insular-Materno Infantil, 35016 Gran Canaria, Spain. Department of Endocrinology and Nutrition, Hospital Universitario Dr. Negrín, 35010 Gran Canaria, Spain. Department of Pneumology, Complejo Hospitalario Universitario Insular-Materno Infantil, 35016 Gran Canaria, Spain. Department of General and Digestive Surgery, Complejo Hospitalario Universitario Insular-Materno Infantil, 35016 Gran Canaria, Spain.