(Salem, OR)  --  Authorities are looking for a 60-year-old Salem man who's been reported missing.  Marion County sheriff's deputies say Gary Risteen left his home on Sanrodee Drive Southeast in Salem around noon yesterday and hasn't been seen since.  Officials say he had recently undergone a medical procedure.  Risteen is described as white, five-feet-eleven, 200 pounds, brown hair and blue eyes, and is probably driving a gold, 2004 Ford F150 with Oregon license plates 443BAF.  Anyone who sees him is asked to call 911.