aThai Red Cross AIDS Research Center and HIV Netherlands Australia Thailand Research Collaboration (HIVNAT), Bangkok, Thailand
bDivision of Preventive Medicine and Public Health, School of Medicine, University of California at San Francisco, California
cCenter for LGBT Health Research, Department of Behavioral and Community Health Sciences, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
Correspondence to Dr Frits van Griensven, Thai Red Cross AIDS Research Center, 104 Ratchadamri Road, Patumwan, Bangkok 10330, Thailand. Tel: +66 900922908; e-mail: firstname.lastname@example.org
Received 1 September, 2012
Revised 23 September, 2012
Accepted 23 September, 2012