*3.2. Number of Study Settings by Countries*

Table 3 show the number of papers categorized by the countries of the study settings as mentioned in abstracts. There was a total of 407 articles describing locations of settings, and 14.3% of these were set up in the United States, making this country the top of the list. Over half of the study settings (55.6%) belonged to the top 10 countries, which are all classified as developed countries.


**Table 3.** Number of papers by countries as study settings.
