Leon Luis R, Ojeda Herminio, Mills Joseph I, Leon Christine R, Psalms Shemuel B, Villar Hugo V
Southern Arizona Veteran Affairs Health Care System, Tucson, AZ, USA.
J Am Coll Surg. 2008 Jan;206(1):171-6. doi: 10.1016/j.jamcollsurg.2007.06.311. Epub 2007 Sep 20.