Correction: Are socio-economic inequalities related to cardiovascular disease risk? A systematic review and meta-analysis of prospective studies - Ololade J. Baruwa; Federica Alberti; Sunday Onagbiye; Annalisa Guddemi; Anna Odone; Hannah Ricci; Maddalena Gaeta; Schmid Daniela; Cristian Ricci (BMC Cardiovascular Disorders)