- Correspondence to Dr Phaik Yeong Cheah, Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Road, Bangkok 10400, Thailand;
- Received 29 July 2014
- Revised 25 October 2014
- Accepted 2 November 2014
- Published online 17 April 2015.
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