1. Department of Obstetrics and Gynecology; Università Cattolica del Sacro Cuore; Rome; Italy
2. Department of Internal Medicine; University of Texas Medical Branch; Galveston; TX; USA
3. University of California; Los Angeles; CA; USA
4. Division of Rheumatology; Institute G. Pini; University of Milan; Istituto Auxologico Italiano; Milan; Italy