Many doctors and other health care professionals nationwide have been victimized this year by identity theft used to fraudulently obtain federal and state tax refunds — and their numbers are growing, medical industry and government officials say. The number of doctors, dentists and nurses targeted by identity theft scams has increased significantly this year, raising questions about a possible security breach of the personal information of medical workers, U.S. Sen. Richard Blumenthal said Thursday. "It is incredible. The scope and size are appalling and astonishing. ... We're talking about hundreds (of doctors) nationally and tens of millions and maybe hundreds of millions of dollars," Blumenthal said.