Effect of Change to a Nucleoside Reverse Transcriptase Inhibitor (NRTI)-Sparing Regimen of Efavirenz (EFV) and Lopinavir/Ritonavir (LPV/r) on Liver Histology in HIV-1-Infected Individuals With Lactic Acidemia and Persistent Alanine Aminotransferase (ALT) Elevations on NRTI-Containing Antiretroviral Therapy - ICH GCP - Clinical Trials Registry