HEISNOTAdoctorbutTonyTanChoonKeatknowsalotaboutmedicine--andthebusinessofprovidinghealthcaretoincreasinglyaffluentAsians.Tan,whosaysheisinhismid-40s,ischairmanofparkwayGroupHealthcare,Singaporesleadingprivatehospitalcompany,andgroupmanagingdirectorofitsparent,parkwayHoldings.AchemicalengineerwhohasanMBAfromtheUniversityofCalifornia,herecentlyspokewithAsiaweeksSanthaOorjitham.Excerpts:Isthebusin...