- Correspondence to Dr Peter H Langlois, Texas Center for Birth Defects Research and Prevention, Texas Department of State Health Services, PO Box 149347, MC 1964, Austin, TX 78714–9347, USA;
- Received September 3, 2013
- Revised April 11, 2014
- Accepted May 15, 2014
- First published June 3, 2014.
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