A Cecile J W Janssens1,2, M Gwinn3. 1. Department of Epidemiology, Rollins School of Public Health, Emory University, 1518 Clifton Road NE, Atlanta, Georgia, 30322, USA. cecile.janssens@emory.edu. 2. Department of Clinical Genetics/EMGO Institute for Health and Care Research, Section Community Genetics, VU University Medical Center, Amsterdam, The Netherlands. cecile.janssens@emory.edu. 3. Department of Epidemiology, Rollins School of Public Health, Emory University, 1518 Clifton Road NE, Atlanta, Georgia, 30322, USA.
Unfortunately, the original version of this article [1] contained an error.Under ‘Study 2’, the text read: “The first search was the same as in the Study 1, except that we screened all articles that were co-cited in more than 1 % of the citing articles.”However, this sentence should have also included articles that were “co-cited more than once”, to read: “The first search was the same as in the Study 1, except that we screened all articles that were co-cited more than once and co-cited in more than 1 % of the citing articles.”We apologise for this error.