1. Health care and Diagnostic Division; Department of Medical Services; Ministry of Health; Thimphu Bhutan
2. Harvard Medical School; Gastroenterology Associates Massachusetts General Hospital; Boston MA USA
3. Royal Institute of Health Sciences; Thimphu Bhutan
4. Sherbutse College; Kanglung, Royal University; Thimphu Bhutan
5. Microbiology unit; Department of Laboratory Medicine; Jigme Dorji Wangchuck National Referral Hospital; Thimphu Bhutan
6. Department of Medicine; Baylor College of Medicine; Houston TX USA