Table 1

The length of comments provided in five of the 19 studies, arranged in descending order according to the total number of comments

AuthorData sourceNo. of commentsLength of comments
Hao et al51Haodf773 279Mean 95.75 characters
Rastegar-Mojarad et al57Yelp79 173Median 635 characters
Wallace et al32RateMDs58 100Median 41 words
Wagland et al48Cancer survey56361–225 words
Plaza-del-Arco et al58Masquemedicos734Mean 44 words