Zeuzem S, Heathcote EJ, Shiffman ML, Wright TL, Bain VG, Sherman M, Feinman SV, Fried MW, Rasenack J, Sarrazin C, Jensen DM, Lin A, Hoffman JH, Sedarati F. Twelve weeks of follow-up is sufficient for the determination of sustained virologic response in patients treated with interferon alpha for chronic hepatitis C. J Hepatol. 2003 Jul; 39(1):106-11.