| 题名 | Sustained intrauterine release of levonorgestrel over five years. |
| 作者 | Nilsson CG |
| 杂志 | Fertil Steril. |
| 年|卷|期 | 1986 Jun;45(6) |
| 页码 | 805-7 |
| 链接 | http://www.ncbi.nlm.nih.gov/pubmed/?term=Fertility+and+sterility+1986+Jun%3B+45(6)%3A805-7. |
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