Your search returned the following 2 documents:

2. Comparison of Envelope 2 CD81 binding regions in PBMC-derived versus serum-derived hepatitis C virus isolates: higher conservation of CD81 region 2 in PBMC isolates
   M.-W. Welker, Christoph Welsch, D. Ochs, W. P. Hofmann, E. Herrmann, A. Piiper, R. W. Hartmann, S. Zeuzem, C. Sarrazin, and Bernd Kronenberger
   Journal of Viral Hepatitis 18 (3): 181-192, 2011
   
1. Deep sequencing reveals mutagenic effects of ribavirin during monotherapy of HCV genotype 1-infected patients
   J. Dietz, Sven-Eric Schelhorn, D. Fitting, U. Mihm, S. Susser, M.-W. Welker, C. Füller, M. Däumer, G. Teuber, H. Wedemeyer, T. Berg, Thomas Lengauer, Stefan Z., E. Herrmann, and C. Sarrazin
   Journal of Virology 87 (11): 6172-6181, 2013