[1] UT Southwestern Med Ctr, Dallas, TX USA
[2] Univ Montreal, Montreal, PQ, Canada
[3] LH F4tel Dieu Qu E9bec, Quebec City, PQ, Canada
[4] Univ Vita Salute San Raffaele, Milan, Italy
[5] Univ Bonn, Bonn, Germany
[6] Johns Hopkins Univ Hosp, Baltimore, MD 21287 USA
[7] Baylor Coll Med, Houston, TX 77030 USA