[1] Oregon Hlth & Sci Univ, Portland, OR 97201 USA
[2] Mayo Clin, Coll Med, Rochester, MN USA
[3] Univ Alberta, Edmonton, AB, Canada
[4] St Marks Hosp, London, England
[5] King Khalid Univ Hosp, Riyadh, Ar Riyad, Saudi Arabia
[6] Pfizer Inc, Collegeville, PA USA
[7] Pfizer Inc, New York, NY USA
[8] Med Univ Vienna, Vienna, Austria