论文部分内容阅读
1968年美国Upjian公司发明了硅橡胶阴道药环,内含200mg醋酸甲地孕酮。1970年Mishell在临床试用,避孕效果良好,但存在不
In 1968 the United States Upjian company invented the silicone rubber vaginal ring, containing 200mg megestrol acetate. 1970 Mishell in clinical trials, the effect of contraception is good, but there is no