[1] Univ Southampton, Southampton Gen Hosp, Southampton, Hants, England
[2] Royal Free London Natl Hlth Serv Fdn Trust, London, England
[3] Univ Med Ctr Utrecht, Utrecht, Netherlands
[4] Oregon Hlth & Sci Univ, Portland, OR 97201 USA
[5] Pfizer Ltd, Surrey, England
[6] Pfizer Inc, New York, NY USA
[7] Pfizer Inc, Groton, CT 06340 USA
[8] Pfizer Hellas SA, Athens, Greece
[9] Univ Hosp Schleswig Holstein, Kiel, Germany