Bishai W R, Graham N M, Harrington S, Page C, Moore-Rice K, Hooper N, Chaisson R E
Department of Molecular Microbiology and Immunology, Johns Hopkins University School of Hygiene and Public Health, Baltimore, MD, USA.
N Engl J Med. 1996 Jun 13;334(24):1573-6. doi: 10.1056/NEJM199606133342404.