Other hospital operators Tenet Healthcare THC.N, Community Health Systems CYH.N and Universal Health Services UHS.N also fell between 12.9% and 17.0%. By Bansari Mayur Kamdar and Amruta Khandekar April 22 (Reuters) - U.S. stocks tumbled on Friday after some weak earnings reports, with growth shares coming under pressure in a torrid week that saw bond yields surge on expectations of interest rate hikes. Adding to inflation worries, U.S. business activity slowed in April as soaring costs for raw materials, fuel and labor pushed input prices to a record high, a survey by S&P Global showed.