- Correspondence to Dr Agnieszka M Rygiel, Institute of Mother and Child, Kasprzaka 17a, Warsaw 01-211, Poland;
- Received 21 January 2017
- Accepted 5 February 2017
- Published in print 1 September 2017.
- Published online 9 August 2017.
- Published first 3 March 2017.
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