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Since 1982 he has held various advisory posts within the UNDP/[[UNFPA]]/[[WHO]]/World Bank Special Programme of Research, Development and Research Training in Human Reproduction at WHO and also within WHO itself. These were: - Infertility Task Force (member 1982 – 1886). Scientific and Ethical Review Group (member 1989 - 2007 (chair 2007 - 2010). Research Review Panel (member 2010- 2014), Research Ethics Review Committee, (Member 2008 – 2010, Appointed by Dr. Margaret Chan. Director W.H.O.), Technical Advisory Group on Devices and Innovations in Male circumcision, Dept. of [[HIV]] (Co-Chair 2010 – to Present date). He has contributed to a number of WHO publications and studies, most recently to the WHO and JHPIEGO Manual Male Circumcision under local anaesthesia 2009 (primary author) and major contributor to the current update (2018). In 2017 he was part of a team that visited the highlands of Papua province (Indonesia) to advise about the feasibility of an [[HIV]] prevention programme that includes Male Circumcision to combat the [[HIV]] epidemic in that region.<ref>{{REFdocument