Articles that support this problem:
Increasing number of authors in Cochrane reviews
2020 : Journal of evidence‐based medicine
More than one-third of Cochrane reviews had gift authors, whereas ghost authorship was rare
2020 : Journal of clinical epidemiology
Group authorships in Cochrane had low compliance with Cochrane recommendations
2020 : Journal of evidence-based medicine
Prevalence of honorary and ghost authorship in Cochrane reviews
2002 : Jama