[1] Univ Autonoma Nuevo Leon, Dr Jose E Gonzalez Univ Hosp, Dept Internal Med, Div Endocrinol, Monterrey, Mexico
[2] Mayo Clin, Div Endocrinol Diabet Metab & Nutr, Knowledge & Evaluat Res Unit Endocrinol, Dept Med, Rochester, MN USA
[3] Mayo Clin, Dept Med, Div Endocrinol Diabet Metab & Nutr, Rochester, MN USA
[4] Univ Autonoma Nuevo Leon, Dr Jose E Gonzalez Univ Hosp, Res Unit, Monterrey, Mexico