Hyoscine butylbromide and progress of labor in primigravidae: methodological concerns: Re: Maged AM, Mosaad M, AbdelHak A, Kotb MM, Salem MM. The effect of hyoscine butylbromide on the duration and progress of labor in primigravidae. A randomized controlled trial. J Matern Fetal Neonatal Med. 2017. [Epub ahead of print]. [doi:10.1080/14767058.2017.1359828]. (4th March 2019)