Representation of Medical Concepts in Emojis Using Medical Subject Headings to Identify Gaps and Opportunities: Cross-Sectional Analysis. - He, Shuhan; Peng, Boyu; Mitragotri, Suhanee; Hassan, Ahmad; Ariss, Abdel Badih el; Monge, Margarita; Kijpaisalratana, Norawit (JMIR Formative Research, 2025)