Maximum likelihood phylogenetic tree representing HIV-1 pol sequences from all included patients with bootstrap values >500 shown on corresponding nodes and significant clusters in boxes. Sequences from patients reporting men who have sex with men (MSM) status are in italic and the presence of surveillance drug resistance mutation (SDRM) in small letters on the right side of the taxon names representing the following nucleoside reverse transcriptase inhibitor (NRTI) mutations: M41L (a), D67G (b), F77L (c), M184V (d), L210W (e), T215C (f), T215D (g), T215S (h), K219E (i), K219R (j); and nonnucleoside reverse transcriptase inhibitor (NNRTI) mutations: K101E (k), K103N (l).