1 Yale School of Medicine, Yale University, New Haven, CT, USA; Centre of Excellence for Research in AIDS (CERiA), Faculty of Medicine, University Malaya, Kuala Lumpur 50603, Malaysia. Electronic address: ahsan.ahmad@yale.edu.
2 Global Commission on Drug Policy, Geneva, Switzerland; Monash University, Subang Jaya, Malaysia; Centre of Excellence for Research in AIDS (CERiA), Faculty of Medicine, University Malaya, Kuala Lumpur 50603, Malaysia.
3 Global Commission on Drug Policy, Geneva, Switzerland.