22nd World Congress of Dermatology, Seoul, 2011. 5th International Congress of Cardiovascular Disease; 2009 June 5-7; Kosice, Slovakia. World Congress of Dermatology, Argentina 2007, 02 (abstract no. D 613 and 1115). Experimental Biology 2000, California, USA 2000. International Conference on Heart Health in Developing Countries, AIIMS, New Delhi, 2000. V International Congress of Tropical Pediatrics, 1998, Jaipur ( 2 papers). First World Congress on Leishmaniasis, Turkey 1997. XIV International Congress for Tropical Medicine & Malaria, Nagasaki, Japan, 1996. 6th International Congress for Infectious Diseases, Czech Republic, 1994. International Congress of Dermatology 1994 AIIMS, New Delhi. XVIII International Conference of Chemotherapy, Stockholm, Sweden 1993. International Congress of Cardiology, Florida USA 1992. World Congress of Dermatology, New York, USA 1992. International Congress of Chemotherapy, Berlin, Germany 1991. XXXII International Congress on History of Medicine, Antwerp, Brussels, Belgium 1990. 2nd Asian Dermatological Congress 1989. International Congress of Tropical Medicine, Amsterdam, Holland 1988. World Congress of Dermatology. Berlin, West Germany, 1987. VII International Congress of Protozoology Nairobi, Kenya, 1985.