IndiaCLEN, one of the seven regional networks of INCLEN (International Clinical Epidemiology Network) is registered as a non-profit health research network with the registrar of societies at Trivandrum, Kerala since 1991. Beginning with membership of 45 INCLEN trained fellows in clinical epidemiology, health economics, biostatistics and health social sciences, IndiaCLEN currently has about 275 members. The core unit of the IndiaCLEN is the Clinical Epidemiological Units (CEU) established in select medical colleges to support the dissemination and application of clinical epidemiological principles in the education/research activities of the respective medical colleges.