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2. Prevention of multiple pregnancies in couples with unexplained or mild male subfertility: randomised controlled trial of in vitro fertilisation with single embryo transfer or in vitro fertilisation in modified natural cycle compared with intrauterine insemination with controlled ovarian hyperstimulation
3. Gonadotropins versus clomifene citrate with or without intrauterine insemination in women with normogonadotropic anovulation and clomifene failure (M-OVIN): a randomised, two-by-two factorial triall;Weiss;Lancet,2017
4. Intrauterine insemination with clomiphene citrate versus expectant management for unexplained infertility: a pragmatic open-label, randomised, controlled, two-centre trial;Farquhar;Lancet,2017
5. Intrauterine insemination with controlled ovarian hyperstimulation versus EM for couples with unexplained subfertility and an intermediate prognosis: a randomised clinical trial;Steures;Lancet,2006