[1] UNIV MINNESOTA, MAYO GRAD SCH MED, DIV THORAC DIS & INTERN MED, ROCHESTER, MN 55901 USA
[2] UNIV MINNESOTA, MAYO GRAD SCH MED, DEPT ORTHOPEDICS, ROCHESTER, MN 55901 USA
[3] UNIV MINNESOTA, MAYO GRAD SCH MED, DEPT ANESTHESIOL, ROCHESTER, MN 55901 USA