Erratum to: Assessment of Vitamin D status in a group of Egyptian children with non alcoholic fatty liver disease (multicenter study). Issue 1 (December 2016) - Mohamed, Amal; Ghany, Maha; Hakeem, Gehan; Mostafa, Aya; Khattab, Rania; Abdalla, Asmaa; El Fotoh, Laila; Mazary, Abdel; Sayed, Madiha; Fadil, Ashraf