China's ratio of male to female babies remains high despite sixth annual fall.
| Autor: | Dai S; School of Public Health, Shandong University., Li X; Shanghai. |
|---|---|
| Jazyk: | angličtina |
| Zdroj: | BMJ (Clinical research ed.) [BMJ] 2015 Feb 17; Vol. 350, pp. h937. Date of Electronic Publication: 2015 Feb 17. |
| DOI: | 10.1136/bmj.h937 |
| Databáze: | MEDLINE |
| Externí odkaz: |
|