Among studies/arms presenting AHD, the time lag between initial HIV diagnosis and AIDS diagnosis or between HIV testing and first reported CD4 cell count was reported in 9 studies/arms as “at time of HIV diagnosis” (referred as 0 month), 3 studies/arms as one month, 8 studies/arms as three months (including 1 study as 60 days and 1 study as 90 days), 4 studies as six months, and 7 studies/arms as twelve months, respectively. The gene discussed is CD4; the disease is AIDS.