[1] Univ Madison Wisconsin, Dept Surg, Madison, WI USA
[2] Howard Univ Hosp, Dept Surg, Washington, DC USA
[3] Aga Khan Univ, Med Coll, Karachi, Pakistan
[4] Vanderbilt Univ, Dept Surg, Med Ctr, Nashville, TN USA
[5] Royal Coll Gen Practitioners, West Midlands Fac, London, England
[6] Harbor UCLA Med Ctr, Dept Surg, Los Angeles, CA USA