[1] Hennepin Cty Med Ctr, Minneapolis, MN 55415 USA
[2] Schering Plough Res Inst, Minneapolis, MN USA
[3] Marshfield Clin Fdn Med Res & Educ, Marshfield, WI 54449 USA
[4] Billings Clin, Billings, MT USA
[5] St Lukes Hosp, Duluth, MN USA
[6] Vet Affairs Med Ctr, Minneapolis, MN 55417 USA
[7] Duluth Clin, Duluth, MN USA