[1] Univ Hosp Udine, ASUI Udine, Dept Clin & Expt Med Sci, Unit Pediat, Pzzale S Maria Misericordia 1, I-33100 Udine, Italy
[2] Univ Hosp Udine, ASUI Udine, Inst Hyg & Clin Epidemiol, Ist Igiene, Pzzale S Maria Misericordia 1, I-33100 Udine, Italy
[3] Univ Udine, Sch Med, Piazzale M Kolbe 3, I-33100 Udine, Italy
[4] Univ Hosp Udine, ASUI Udine, Clin Chirurg, Dept Surg, Pzzale S Maria Misericordia 1, I-33100 Udine, Italy
[5] Univ Trieste, Fac Med & Chirurg, Str Fiume 447, I-34149 Trieste, Italy
[6] ASL Benevento, Pediat Primary Care, Via Giuseppe Piermarini 12, I-82100 Benevento, Italy
[7] Univ Glasgow, Inst Hlth & Wellbeing, Gen Practice & Primary Care, 1 Lilybank Gardens, Glasgow G12 8RZ, Lanark, Scotland