1 National Head of the Dermatology Study Group of the Italian Federation of General Pediatricians, Rome, Italy.
2 University of Rome "Guglielmo Marconi," Rome, Italy.
3 Dermatology Unit, AORN Santobono-Pausilipon, Naples, Italy.
4 Pediatric Gastroenterology and Liver Unit, Maternal and Child Health Department, Sapienza University of Rome, Rome, Italy.
5 Pediatric Gastroenterology and Liver Unit, Maternal and Child Health Department, Sapienza University of Rome, Rome, Italy. Electronic address: salvatore.oliva@uniroma1.it.