Erratum

This article [1] was unintentionally published twice in this journal, by the same authors. The following should be considered the version of record and used for citation purposes: "Sanaei et al., Calcium vitamin D3 supplementation in clinical practice: side effect and satisfaction, Journal of Diabetes & Metabolic Disorders (2016) 15:5, 10.1186/s40200-016-0227-9". The duplicate "Sanaei et al., Calcium vitamin D3 supplementation in clinical practice: side effect and satisfaction, Journal of Diabetes & Metabolic Disorders (2016) 15:9, 10.1186/s40200-016-0231-0" is to be ignored. Editor-in-Chief Prof Bagher Larijani apologizes to the readers of the journal for not detecting the duplication during the publication process.