Table 1.

Tools used for sentiment analysis.

Author	Year	Location	Subject area	Sentiment toward	Type of method
Bhattacharya et al [27]	2012	United States	Public health	25 Federal health agencies	Open source
Black et al [28]	2011	United States	Emergency medicine	2011 Japanese earthquake and tsunami	Commercial
Cole-Lewis et al [29]	2013-2014	United States	Public health	Electronic cigarette	Produced for study
Daniulaityte et al [30]	2016	United States	Public health	Sentiment toward drug-related tweets	Produced for study
Desai et al [31]	2011	United States	Medical conference	Twitter activity at Kidney Week 2011	Produced for study
Greaves et al [32]	2012	United Kingdom	Public health	Hospital quality	Commercial
Hawkins et al [33]	2015	United States	Public health	Hospital quality	Open source
Myslin et al [34]	2012	Global	Public health	Tobacco	Produced for study
Nwosu et al [35]	2015	Global	Disease specific	Palliative medicine	Open source
Ramagopalan et al [26]	2006-2014	United States	Disease treatment	Multiple sclerosis treatments	Open source
Sofean and Smith [36]	2013	United States	Public health	Tobacco	Produced for study
Tighe et al [37]	2015	United States	Disease symptoms	Pain	Produced for study