Correction: 3D Bioprinting Technologies for Hard Tissue and Organ Engineering. Materials 2016, 9, 802.

In the published manuscript “3D Bioprinting Technologies for Hard Tissue and Organ Engineering. Materials 2016, 9, 802 [1]”, a reference (Ozbolat, I.T., Yu, Y. Bioprinting toward organ fabrication: challenges and future trends. IEEE Trans. Biomed. Eng. 2013, 60, 691–699) has been omitted from the references. Alterations are therefore requested to add this reference before the original reference 22 in the reference list, in the legend of Figure 2, as well as in the context (such as [17-23] in page 2 line 15, [12-23,26-28] in page 2 line 23). The following references after reference 22 therefore need to be changed. We apologize for the inconvenience this will have caused. In addition, the following changes to the text have been made:

Page 11, Section 3.3, the expression “such as stem cells” which appears six lines up from the bottom should be changed to “such as adipose-derived stem cells (ADSCs)”.

Page 18, reference 46, the page range should be “298–310”.

The changes do not affect the results. The manuscript will be updated and the original will remain online on the article webpage.