[1] UNIV CATTOLICA SACRO CUORE, SCH MED, INST PHARMACOL, I-00168 ROME, ITALY
[2] ST THOMAS HOSP, UNITED MED & DENT SCH GUYS & ST THOMAS, DEPT PHYSIOL, LONDON SE1 7EH, ENGLAND
[3] UNIV LONDON ST BARTHOLOMEWS HOSP & MED COLL, DEPT ENDOCRINOL, LONDON EC1A 7BE, ENGLAND