A team at the University of Ottawa, led by Dr. Elisa Romano, is currently conducting a randomized control trial of PDEP.  This five-year project is well underway.

A team at McGill University is conducting a cluster randomized control trial in Indonesia.  You can read about the methodology here.

A research firm in Sweden (FCG Sweden) has carried out a qualitative study of the impact of PDEP on parents and children over time.  This study was conducted in Kosovo.  You can read a summary of their findings here (hyperlink coming).