Hélder Ferreira
Centro Hospitalar do Porto, Centro Materno-Infantil do Norte, Porto, Portugal

João Bernardes
ULS Matosinhos - Hospital Pedro Hispano, Matosinhos, Portugal
Faculty of Medicine of the University of Porto, Porto, Portugal

Cristina Nogueira-Silva
Hospital de Braga, Braga, Portugal
School of Medicine, University of Minho, Braga, Portugal