title: Validity of block randomized clinical trials.
authors.affiliation: Department of Obstetrics, Gynaecology and Reproductive Medicine, VU University Medical Center, Amsterdam, The Netherlands.
authors.forename: Velja
authors.initials: V
authors.lastname: Mijatovic
authors.affiliation: Department of Obstetrics, Gynaecology and Reproductive Medicine, VU University Medical Center, Amsterdam, The Netherlands.
authors.forename: Alyde
authors.initials: A
authors.lastname: de Kraker
authors.affiliation: Department of Obstetrics, Gynaecology and Reproductive Medicine, VU University Medical Center, Amsterdam, The Netherlands.
authors.forename: Marc
authors.initials: M
authors.lastname: van der Vusse
authors.affiliation: Department of Obstetrics, Gynaecology and Reproductive Medicine, VU University Medical Center, Amsterdam, The Netherlands.
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Krebber
mesh_terms: D001241:Aspirin / Q000627:therapeutic use; D004305:Dose-Response Relationship, Drug; D019317:Evidence-Based Medicine; D005260:Female; D005307:Fertilization in Vitro / Q000379:methods; D006801:Humans; D015201:Meta-Analysis as Topic; D010975:Platelet Aggregation Inhibitors / Q000627:therapeutic use; D011897:Random Allocation; D016032:Randomized Controlled Trials as Topic; D015203:Reproducibility of Results
chemical_list: D010975:Platelet Aggregation Inhibitors; D001241:Aspirin