CD4 and AIDS: 18 Goetz Goetz MB MB Boscardin Boscardin WJ WJ Wiley Wiley D D Alkasspooles Alkasspooles S S Decreased recovery of CD4 lymphocytes in older HIV-infected patients beginning highly active antiretroviral therapy Decreased recovery of CD4 lymphocytes in older HIV-infected patients beginning highly active antiretroviral therapy AIDS AIDS 2001 2001 8 8 17 17 15 15 12 12 1576 1576 9 9 11504992 11504992