BJOG : an International Journal of Obstetrics and Gynaecology, 120, 1588-1598 BJOG: An International Journal of Obstetrics and Gynaecology, 120(13), 1588-1598. Wiley Online Library Roos, C, Borowiack, E, Kowalska, M, Zapalska, A, Mol, B W, Mignini, L, Meads, C, Walczak, J & Khan, K S 2013, ' What do we know about tocolytic effectiveness and how do we use this information in guidelines? A comparison of evidence grading ', BJOG: An International Journal of Obstetrics and Gynaecology, vol. 120, no. 13, pp. 1588-1598 . https://doi.org/10.1111/1471-0528.12388 BJOG : an International Journal of Obstetrics and Gynaecology, 120, 13, pp. 1588-1598