In addition, the following journals were searched individually to find out any missing articles: The Angle Orthodontists, American Journal of Orthodontics and Dentofacial Orthopedics, European Journal of Orthodontics, Korean journal of orthodontics, and Journal of Orofacial Orthopedics.
Another form of publication bias is missing articles.
To confirm the quality of the literature searches and identify missed articles, bibliographies of representative meta-analyses were screened [ 5– 12].
Therefore, we assumed that the number of missed articles did not significantly affect our study results.
However, we managed to retrieve 98.5% of all published articles in the field, therefore we assumed that the number of missed articles did not significantly affect our study results.
However, we believe that the number of missed articles did not significantly affect our study results because our survey scheme was designed to understand the overall trends in infectious disease research by obtaining the relative numbers of research articles per country or region, not to strictly count the absolute numbers of articles.
We may have missed articles that addressed the issue of transferability without it being mentioned in the abstract.
Some modifications of our method could help identify these articles; for example, as shown in Table 2, half of the missed articles were connected with retrieved articles through direct citations.
We might have also missed articles that refer to the effect of rosiglitazone on the risk of myocardial infarction, either favourably or unfavourably, without directly citing the index articles.
We consider it unlikely that we have selectively missed articles that gave more forthright interpretations of evidence either on sleeping position and SIDS or on the sexual transmissibility of HIV.
