[1] Univ Calif San Francisco, Vet Affairs Med Ctr, Endocrine Unit, San Francisco, CA 94143 USA
[2] Jackson Lab, Bar Harbor, ME 04609 USA
[3] St Josephs Hosp, Bangor, Gwynedd, Wales
[4] Univ Calif San Francisco, Dept Radiol, San Francisco, CA 94143 USA