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| 2005, Vol. 7(1): 25-28 DOI: | ||
| An initial epidemiologic investigation of preterm infants in cities of China | ||
| WEI Ke-Lun, YANG Yu-Jia, YAO Yu-Jia, DU Li-Zhong, SUN Ji-Ping | ||
| The Subspecialty Group of Neonatology，Pediatric Society，Chinese Medical Association | ||
| Received null Revised null | ||
| Supporting info | ||
