[1] Stanford Univ, Palo Alto, CA 94304 USA
[2] Univ Toronto, Mt Sinai Hosp, Toronto, ON M5G 1X5, Canada
[3] Centocor R & D Inc, Malvern, PA USA
[4] Univ Penn, Sch Med, Philadelphia, PA 19104 USA
[5] JJPS LLC, Malvern, PA USA
[6] Karolinska Inst, Karolinska Hosp, S-10401 Stockholm, Sweden
[7] Altoona Ctr Clin Res, Duncansville, PA USA