1. From the Mayo Clinic, Rochester, Minnesota; Universitaire Ziekenhuizen Leuven and Gasthuisberg, Leuven, Belgium; University of British Columbia, Vancouver, British Columbia, Canada; University of Chicago, Chicago, Illinois; Hôpital Claude Huriez and Centre Hospitalier et Universitaire de Lille, Lille, France; University of Calgary, Calgary, Alberta, Canada; Imelda General Hospital, Bonheiden, Belgium; and Abbott Laboratories, Parsippany, New Jersey, and Abbott Park, Illinois.