1 Department of Health Promotion, Maternal and Child Care, Internal Medicine and Medical Specialties "G.D'Alessandro", University of Palermo, Palermo, Italy. Electronic address: chiara.albano@unipa.it.
2 Department of Health Promotion, Maternal and Child Care, Internal Medicine and Medical Specialties "G.D'Alessandro", University of Palermo, Palermo, Italy. Electronic address: linares.giulia11@gmail.com.
3 Department of Health Promotion, Maternal and Child Care, Internal Medicine and Medical Specialties "G.D'Alessandro", University of Palermo, Palermo, Italy. Electronic address: vali.garbo@gmail.com.
4 Department of Health Promotion, Maternal and Child Care, Internal Medicine and Medical Specialties "G.D'Alessandro", University of Palermo, Palermo, Italy. Electronic address: stefania.stancampiano26@gmail.com.
5 Division of Pediatric Infectious Diseases, "G. Di Cristina" Hospital, ARNAS Civico Di Cristina Benfratelli, Palermo, Italy. Electronic address: giordano.s@tiscali.it.
6 Department of Health Promotion, Maternal and Child Care, Internal Medicine and Medical Specialties "G.D'Alessandro", University of Palermo, Palermo, Italy; Division of Pediatric Infectious Diseases, "G. Di Cristina" Hospital, ARNAS Civico Di Cristina Benfratelli, Palermo, Italy. Electronic address: claudia.colomba@libero.it.