[1] Sofia Univ St Kliment Ohridski, Univ Hosp Lozenetz, Dept Clin Immunol, Sofia, Bulgaria
[2] Univ Roma Tor Vergata, Div Endocrinol Metab & Diabet, Dept Syst Med, CTO A Alesini Hosp,Diabet Res Inst Federat, Rome, Italy
[3] St Camillus Int Univ Hlth Sci, UniCamillus, Rome, Italy
[4] Universal Sci Educ & Res Network USERN, Network Immun Infect Malignancy & Autoimmun NIIMA, Rome, Italy