I'd be interested to know whether the author considered or excluded the following journals that I have identified as being mega-journals (see http://cofactorscience.com/journal-selector and choose the option 'All sound science' under 'How selective would you like the journal to be?'): CMAJ Open, Cureus, Ecosphere, F1000Research, Gigascience, SAGE Open Medicine, ScienceOpen Research. Some of these may have been excluded because they are very new or because they have unconventional peer review, others may perhaps be too specialised, but perhaps some of these could usefully have been included in the study.