Circulating VEGF-A Levels in Relation to Retinopathy of Prematurity and Treatment Effects: A Systematic Review and Meta-Analysis oleh Ulrika Sjöbom, MSc, Tove Hellqvist, BSc, Jhangir Humayun, MD, Anders K. Nilsson, PhD, Hanna Gyllensten, PhD, Ann Hellström, MD, PhD, Chatarina Löfqvist, PhD