[1]Department of Physiology;
Faculty of Medicine and Allied Sciences;
Rajarata University of Sri Lanka;
Anuradhapura 50000;
North Central Province;
Sri Lanka;
[2]Department of Physiology;
Faculty of Medicine;
University of Kelaniya;
Ragama 11010;
Western Province;
Sri Lanka;
[3]Clinical Physiologist and Senior Lecturer in Physiology;
Faculty of Medicine;
University of Colombo;
Sri Lanka;
[4]Department of Pediatrics;
Faculty of Medicine;
University of Kelaniya;
Ragama 11010;
Western Province;
Sri Lanka;
Health related quality of life; Functional gastrointestinal disorders; Abdominal pain; Asthma; Children;