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RETRACTION
Retraction: Application of 3D printing technology in orthopedic medical implant – Spinal surgery as an example
Rong Feng Zhang,
Peng Yun Wang,
Ming Yang,
Xuebo Dong,
Xue Liu,
Yiguang Sang,
An Tong
Published: 12 July 2019
© 2019 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )