Postnatal growth standards for preterm infants: the Preterm Postnatal Follow-up Study of the INTERGROWTH-21st Project oleh Prof. José Villar, MD, Francesca Giuliani, MD, Prof. Zulfiqar A Bhutta, PhD, Prof. Enrico Bertino, MD, Eric O Ohuma, MSc, Leila Cheikh Ismail, PhD, Prof. Fernando C Barros, MD, Prof. Douglas G Altman, DSc, Prof. Cesar Victora, MD, Prof. Julia A Noble, DPhil, Michael G Gravett, MD, Manorama Purwar, MD, Prof. Ruyan Pang, MD, Ann Lambert, PhD, Aris T Papageorghiou, MD, Roseline Ochieng, MMed, Yasmin A Jaffer, MD, Prof. Stephen H Kennedy, MD