Authors' reply to the letter to the editor of P.M. Foye et al. concerning "CT Morphology and Morphometry of the normal adult coccyx" by Woon JT et al. (2013); Eur Spine J 22(4):863-870. - Woon JT; Stringer MD (European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2014)