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