1. Department of Pediatric Surgery, Centro Hospitalar e Universitário de Coimbra, Hospital Pediátrico, Coimbra, Portugal.
2. Department of Pediatric Surgery, Hospital de Braga, Braga, Portugal.
3. Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal.
4. ICVS/3B's-PT Government Associate Laboratory, Braga, Guimarães, Portugal.