Variable sources of Bk virus in renal allograft recipients - Urbano, Paulo Roberto P; Nali, Luiz H. da Silva; Oliveira, Renato dos R; Sumita, Laura M; Fink, Maria Cristina D. da Silva; Pierrotti, Ligia C; Bicalho, Camila da Silva; David-neto, Elias; Pannuti, Cláudio Sérgio; Romano, Camila M (Journal of medical virology, 2019)