[1] Psychiat Hosp Maracaibo, Maracaibo, Venezuela
[2] Univ Zulia, Endocrine & Metab Dis Res Ctr, Sch Med, 20th Ave 4004, Maracaibo, Venezuela
[3] Univ Simon Bolivar, Fac Ciencias Salud, Barranquilla, Colombia
[4] Harvard Med Sch, Brigham & Womens Hosp, Pulm & Crit Care Med Dept, Boston, MA 02115 USA
[5] Cent Univ Venezuela, Sch Med Jose Maria Vargas, Clin Pharmacol Unit, Caracas, Venezuela