- Correspondence to Dr Humberto Azpurua, Maternal Fetal Medicine, Centro Materno Fetal Santa Paula Av, Circunvalación del Sol, Urb Santa Paula Caracas, 1059, Venezuela;
- Received 28 December 2016
- Revised 15 March 2017
- Accepted 22 March 2017
- Published online 5 April 2017.
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