[1] Univ Calif Los Angeles, Med Ctr, Pfleger Liver Inst, Dept Med,David Geffen Sch Med, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, David Geffen Sch Med, Dept Surg, Los Angeles, CA 90095 USA
[3] Olive View UCLA Med Ctr, Dept Med, Sylmar, CA USA
[4] Univ Catolica Santiago Guayaquil, Dept Cirugia & Med, Guayaquil, Ecuador