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| Estimation of gestational age at birth. Comparison of two methods | 146 |
| December 2012 | January 2013 | February 2013 | March 2013 | April 2013 | May 2013 | June 2013 | |
| Estimation of gestational age at birth. Comparison of two methods | 9 | 23 | 10 | 9 | 11 | 16 | 5 |
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