CD4 and lymphopenia: Belaunzarán-Zamudio Belaunzarán-Zamudio PF PF ,  Azzoni Azzoni L L ,  Canaday Canaday DH DH ,  Caro-Vega Caro-Vega YN YN ,  Clagett Clagett B B ,  Rassool Rassool MS MS ,  Rodriguez Rodriguez B B ,  Sanne Sanne I I ,  Sereti Sereti I I ,  Sierra-Madero Sierra-Madero JG JG ,  Lederman Lederman MM MM Immunologic effects of maraviroc in HIV-infected patients with severe CD4 lymphopenia starting antiretroviral therapy.