1 Pediatric Department of Southern Switzerland, San Giovanni Hospital, 6500 Bellinzona, Switzerland.
2 Pediatric Department of Southern Switzerland, San Giovanni Hospital, 6500 Bellinzona, Switzerland; University Children's Hospital, Inselspital, 3010 Bern, Switzerland; University of Bern, 3010 Bern, Switzerland.
3 Pediatric Department of Southern Switzerland, San Giovanni Hospital, 6500 Bellinzona, Switzerland. Electronic address: gianpaolo.ramelli@eoc.ch.