In 1996, he received the license to teach Roumen kungfu, a form of traditional Chinese martial arts. To date, he has studied it for 20 years, and has had 10 years of teaching experience.

1996年他得到了中国传统武术柔门功的教学许可：截止今日，他研习该功法已有20年，并拥有10年的教学经验。

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Mr Frans Roumen, a gynaecologist at the Atrium Medisch Centrum in Heerlen, in the Netherlands, said his studies, published in the journal Human Reproduction showed it to be as effective as oral contraceptives.

BBC: Contraceptive ring 'as good as Pill'