1. Quest Diagnostics, Inc.-Nichols Institute (D.A.F., J.C.N., E.I.C.), San Juan Capistrano, California 92690-6130
2. Kaiser Permanente Medical Care Program of Northern California (E.J.S., J.H.G.), Oakland, California 94611
3. Oregon Health Sciences University Center (S.L.F.), Loma Linda, California 97201-3011
4. Kaiser Permanente Northwest (S.H.M.), Beaverton, Oregon 97005