Correction: National school food standards in England: a cross-sectional study to explore compliance in secondary schools and impact on pupil nutritional intake - Miranda Pallan; Marie Murphy; Breanna Morrison; Alice Sitch; Ashley Adamson; Suzanne Bartington; Alexandra Dobell; Rhona Duff; Emma Frew; Tania Griffin; Kiya Hurley; Emma Lancashire; et al. (International Journal of Behavioral Nutrition and Physical Activity)