A 72-week Randomized Clinical Trial Comparing the Safety and Efficacy of Three Initial Antiretroviral Regimens -GPO-VIR S (d4T/3TC/NVP) for 24 Weeks Followed by GPO-VIR Z (AZT/3TC/NVP) vs GPO-VIR Z vs TDF/FTC/NVP - ICH GCP - Clinical Trials Registry