Funding for this research was provided by:
Grant No. RC12/133 (Grant No. RC12/133)
Received: 25 May 2018
Revised: 31 July 2018
Accepted: 15 August 2018
First Online: 21 September 2018
Ethics approval and consent to participate
: The institutional review board (IRB) at King Abdulla International Medical Research Centre (KAIMRC), Saudi Arabia approved this study. Samples (i.e. placentae and umbilical cords) were obtained from uncomplicated human pregnancies (38–40 gestational weeks) following informed patient consent.
: Not applicable. All authors agree to publish this manuscript.
: The authors declare that they have no competing interests.
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