*4.5. Limitations*

In this study, we introduced an efficient approach to analyzing the extant literature about quality of life among asthmatics. Nonetheless, there exist some limitations. Even though a fairly large proportion of publications relating to quality of life is available on WoS, the choice of WoS as the only data source would leave out relevant studies. Another limitation that should be acknowledged is that the language of selected papers was restricted to English, potentially causing a bias toward English-speaking countries. Besides, instead of analyzing full texts, the content analysis and text mining involved solely titles and abstracts. Nevertheless, provided that the major content of a study is normally included in the title and abstract, this bibliometric analysis is able to provide meaningful findings and offer a comprehensive overview of current research trends.
