Buddha Basnyat1, Abhilasha Karkey2. 1. Oxford University Clinical Research Unit-Nepal, Patan Academy of Health Science, Kathmandu, PO Box 3596, Nepal. Electronic address: buddha.basnyat@ndm.ox.ac.uk. 2. Oxford University Clinical Research Unit-Nepal, Patan Academy of Health Science, Kathmandu, PO Box 3596, Nepal.