ClinicalTrials.gov
http://clinicaltrials.gov/

Copenhagen HIV Programme (CHIP)
http://www.cphiv.dk/

MRC Clinical Trials Unit (CTU)
http://www.ctu.mrc.ac.uk/

National Study of HIV in Pregnancy and Childhood (NSHPC)
http://www.nshpc.ucl.ac.uk/

UK Collaborative HIV Cohort Study (UK CHIC)
http://www.ukchic.org.uk/

UK HIV Drug Resistance Database
http://www.hivrdb.org.uk