A prospective study was performed to continuously collect data from 50 patients ( age range from 19 to 60 years , male versus female 20/30 ) whose BMIs were less than 25 kg/m <formula> ^ { 2 } </formula> ( group A ) and 50 patients ( age range from 21 to 82 years , male versus female 24/26 ) whose BMIs were equal to or more than 25 kg/m <formula> ^ { 2 } </formula> ( group B ) .