Author Affiliations

N.V. Joshi,^a,* M. Doria,^b,** and H. Medina^a

^aFaculty of Medicine, Department of Physiology, Hospital of University of Los Andes, University of Los Andes. Merida, Venezuela

^bFaculty of Medicine, Department of Internal Medicine, Hospital of University of Los Andes, University of Los Andes. Merida, Venezuela

^*phone: 58-274-24033110; fax: 58-274-2638304; Faculty of Medicine, Merida - Venezuela, 5101.

^**phone: 58-274-2403223; Faculty of Medicine, Merida - Venezuela, 5101.