[1] Univ Penn, Philadelphia, PA 19104 USA
[2] Univ N Carolina, Chapel Hill, NC USA
[3] VCU Hlth Syst, Richmond, VA USA
[4] Henry Dunant Hosp, Dept Med & Hepatol, Athens, Greece
[5] Inst Infectol Emilio Ribas, Sao Paulo, Brazil
[6] Vet Affairs Med Ctr, Long Beach, CA USA
[7] IST GmbH, Gunzburg, Germany
[8] Roche, Basel, Switzerland