Analysis 1.1. Comparison 1 Operative hysteroscopy versus control in women with otherwise unexplained subfertility and suspected major uterine cavity abnormalities, Outcome 1 Clinical pregnancy.. .. .. .. .. .. . Analysis 1.2. Comparison 1 Operative hysteroscopy versus control in women with otherwise unexplained subfertility and suspected major uterine cavity abnormalities, Outcome 2 Adverse events: miscarriage.. .. .. .. .. Analysis 2.1. Comparison 2 Operative hysteroscopy versus control in women undergoing medically assisted reproduction with suspected major uterine cavity abnormalities, Outcome