Document is current

Article History

Received: 2 November 2017

Accepted: 12 March 2018

First Online: 20 March 2018

Ethics approval and consent to participate

: Umbilical cord tissues were obtained in accordance with the guidelines outlined in the Ethical Committee Agreement created by the Ethics Committee of Damascus University. Informed consent was obtained from each patient.

: All authors of the manuscript have read and agreed to its content.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.