The exclusion criteria are as follows : ( @ ) pregnancy , ( @ ) diabetes mellitus , ( @ ) tobacco use , ( @ ) alcohol abuse , ( @ ) evidence of nonchagasic heart disease , ( @ ) depression , ( @ ) dysphagia with evidence of food residues in the esophagus , ( @ ) dysphagia with weight loss higher than @ % of usual weight in the last four months and/or ( @ ) conditions that may result in low protocol adherence .