1. From the Warde Medical Laboratory, Ann Arbor, Mich (Dr Keren);the Texas Medical Center, Houston (Dr Alexanian); The University of Iowa, Iowa City (Dr Goeken); Mt Sinai Medical Center, New York, NY (Dr Gorevic); the Mayo Medical School, Mayo Clinic and Foundation, Rochester, Minn (Dr Kyle); and The University of Wisconsin, Madison (Dr Tomar).