NEWYORK(Reuters)-StocksclosedlittlechangedonMonday,pausingafterhittingrecordhighslastweek,butstrengthinhealthcareissueshelpedtokeepdeclinesincheck.TheS&P500healthcaresectorclimbed0.7percentandwastheday'sbestperformer.SharesofTheravancejumped17.9percentto$41.20afterIrishdrugmakerElanagreedtoa$1billiondealtobuy21percentoftheroyaltiesthatTheravancereceivesfromGlaxoSmithKlinef...