Public Response to Federal Electronic Cigarette Regulations Analyzed Using Social Media Data Through Natural Language Processing: Topic Modeling Study. - Lin, Shuo-Yu; Tulabandu, Sahithi Kiran; Koch, J Randy; Hayes, Rashelle; Barnes, Andrew; Purohit, Hemant; Chen, Songqing; Han, Bo; Xue, Hong (Journal of Medical Internet Research, 2024)