HEPLA: A multicenter study on demographic and disease characteristics of patients with hepatitis C in Latin America Luis Viola; Sebastian Marciano; Luis Colombato; Henrique Coelho; Hugo Cheinquer; Gabriela Bugarin; Fernando Tatsch; Roberto J. Carvalho-Filho; Juan P. Roblero; Adriana Varon; Jaime Holguin; Maria R. Torres-Ibarra; Alma M. Pérez-Ríos;