Idiopathic CD4+ Lymphocytopenia: Natural History and Prognostic Factors. - Zonios, Dimitrios; Falloon, Judith; Bennett, John; Shaw, Pamela; Chaitt, Doreen; Polis, Michael; Kovacs, Joseph; Davey, Richard; Lane, H. Clifford; Masur, Henry; Sereti, Irini (International Journal of Infectious Diseases, 2008)