Jeewandara C., Karunananda MV., Fernando S., Danasekara S., Jayakody G., Arulkumaran S., Samaraweera NY., Kumarawansha S., Sivaganesh S., Amarasinghe G., Jayasinghe C., Wijesekara D., Marasinghe MB., Mambulage U., Wijayatilake H., Senevirathne K., Bandara ADP., Gallage CP., Colambage NR., Udayasiri AAT., Lokumarambage T., Upasena Y., Weerasooriya WPKP., seroprevalence study group ., Tan TK., Townsend A., Ogg G., Malavige GN., Study groups ., Perera L., Pushpakumara P., Gomes L., Jayamali J., Aberathna IS., Nimasha T., Dissanayake M., Ramu S., Peranantharajah D., Colambage H., Wickramanayake R., Chathurangika H., Bary F., Yatiwelle S., Harvie M., Deheragoda M., Jayadas T., Ishara S., Ariyaratne D., Dayarathna S., Wijekulasuriya R., Ranathunga C.