[1] Fac Med, BR-17519030 Marilia City, SP, Brazil
[2] Univ Fed Sao Paulo, Emergency & Urgency Dept, Sao Paulo, Brazil
[3] Univ Fed Sao Paulo, Evidence Based Med Dept, Sao Paulo, Brazil
[4] Univ Fed Sao Paulo, Postgrad Studies Therapeut & Intern Med Escola Pa, Sao Paulo, Brazil
[5] Cochrane Ctr Brazil, Sao Paulo, Brazil
[6] Univ Fed Sao Paulo, Postgrad Studies Gastroenterol Surg Escola Paulis, Sao Paulo, Brazil