Correction: "Reduction in BMI z-score and improvement in cardiometabolic risk factors in obese children and adolescents. The Oslo adiposity intervention study - a hospital/public health nurse combined treatment." - Kolsgaard Magnhild L; Joner Geir; Brunborg Cathrine; Anderssen Sigmund A; Tonstad Serena; Andersen Lene (BMC, 2012)