[1] Univ Washington, 1959 North East Pacific St,Box 356522, Seattle, WA 98195 USA
[2] MidCent Dist Hlth Board, Palmerston North, New Zealand
[3] Univ Pittsburgh, Pittsburgh, PA USA
[4] Univ Penn, Philadelphia, PA 19104 USA
[5] Johns Hopkins Univ, Baltimore, MD USA
[6] Mayo Clin Rochester, Rochester, MN USA
[7] Oregon Hlth & Sci Univ, Portland, OR 97201 USA
[8] Univ Texas Southwestern, Dallas, TX USA
[9] Univ Chicago, Chicago, IL 60637 USA
[10] Univ Michigan, Ann Arbor, MI 48109 USA
[11] Beth Israel Deaconess Med Ctr, Boston, MA 02215 USA