PT - JOURNAL ARTICLE ED - , TI - Original Research DP - 2007 Jun 20 TA - Ochsner Journal PG - 77--93 VI - 7 IP - 2 4099 - http://www.ochsnerjournal.org/content/7/2/77.short 4100 - http://www.ochsnerjournal.org/content/7/2/77.full SO - Ochsner J2007 Jun 20; 7