[1] Univ Bristol, Div Med, Bristol, Avon, England
[2] San Raffaele Sci Inst, I-20132 Milan, Italy
[3] Stadt Krankenhaus Munchen Schwabing, Diabet Res Inst, Munich, Germany
[4] Univ Florida, Coll Med, Dept Pediat, Gainesville, FL USA
[5] Univ Florida, Coll Med, Dept Pathol, Gainesville, FL USA
[6] Univ Colorado, Hlth Sci Ctr, Barbara Davis Ctr Childhood Diabet, Denver, CO 80262 USA