Comments on: Ye and Zhang (2019) 'visualizing the knowledge structure of medication-adherence research: A bibliometric analysis (1997-2016)', International Journal of Health Planning and Management, 34: 1333-1353.

Ye and Zhang used inappropriate search keywords, databases, and methods published a bibliometric paper in the International Journal of Health Planning and Management. The comment pointed out the problems, evidence, and improved methods of the study. The authors missed many medication-adherence documents. However, many documents not related to medication-adherence are included. Finally, appropriate search keywords and methods are proposed.