Isolation of a Human Betaretrovirus from Patients with Primary Biliary Cholangitis oleh Mariam Goubran, Weiwei Wang, Stanislav Indik, Alexander Faschinger, Shawn T. Wasilenko, Jasper Bintner, Eric J. Carpenter, Guangzhi Zhang, Paulo Nuin, Georgina Macintyre, Gane K.-S. Wong, Andrew L. Mason