Sequencing and analysis of John Cunningham polyomavirus DNA from acquired immunodeficiency syndrome patients with progressive multifocal leukoencephalopathy oleh Cai-Qin Hu, Jun-Wei Su, Meng-Yan Wang, Yong-Zheng Guo, Li-Jun Xu, Ran Tao, Yi-Rui Xie, Ying Huang, Biao Zhu, Jing Ni, Li-Shao Guo.