Healthcare and bank shares pull stocks lower

U.S. stocks are slumping in Monday morning trading as healthcare companies and banks take the biggest losses. Energy companies are inching higher as oil prices rise. Major indexes in Europe and Asia are also starting the week on a steep skid. The Dow Jones industrial average was down 108 points, or 0.6%, to 18,153 as of 10:15 a.m. The Standard & Poor's 500 index fell 10 points, or 0.4%, to 2,155.