ResultsDemographics of the volunteersTwenty-six healthy volunteers from students at the Facultyof Associated Medical Sciences, Chiang Mai University,were included. Their characteristics are summarized inTable 1. A total of 13 healthy women (aged 20.53 1.19years) and 13 healthy men (21.46 1.19 years) had anormal BMI (20.59 1.63 and 21.47 1.75 kg m2respectively).