LOS ANGELES >> The Dodgers placed center fielder Joc Pederson on the 7-day concussion DL retroactive to Wednesday.Pederson, 25, said he'd never been diagnosed with a concussion before colliding with the outfield wall, and teammate Yasiel Puig, attempting to catch a fly ball Tuesday night.Any initial optimism that Pederson could return quickly was dashed when he continued to feel "a little off.