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Table 2 Authorship characteristics of included studies (n = 217)

From: Collaboration in orthodontic clinical trials: prevalence and association with sample size and funding

Number of authors in each study Number of studies
1–2 n = 15
3–6 n = 160
7–9 n = 37
> 9 n = 5
Institutions of authors Number of authors
Community-based n = 4
Non-university hospital n = 61
University hospital n = 930
Practice-based n = 56
Other n = 5
No information n = 26