X-STOP VERSUS DECOMPRESSIVE SURGERY FOR LUMBAR NEUROGENIC CLAUDICATION - A RANDOMIZED CONTROLLED TRIAL WITH TWO-YEARS FOLLOW-UP: O78.Björn Strömqvist; Svante, Berg; Paul, Gerdhem; Ragnar, Johnsson; Anders, Möller; Tage, Sahlstrand; Ahmed, Soliman; Tycho, TullbergSpine Journal Meeting Abstracts: 2013 - Volume - Issue - ppg 55 Free