Correction to: Ortiz AJ, Fernández E, Vicente A, Calvo JL, Ortiz C. Metallic ions released from stainless steel, nickel-free, and titanium orthodontic alloys: toxicity and DNA damage. Am J Orthod Dentofacial Orthop. 2011;140:e115-22.
In the above-referenced article, the fourth author’s surname is incorrect. The correct spelling of this author is: José Luis Calvo Guirado.