Assessing Associations Between COVID-19 Symptomology and Adverse Outcomes After Piloting Crowdsourced Data Collection: Cross-sectional Survey Study. - Flaks-Manov, Natalie; Bai, Jiawei; Zhang, Cindy; Malpani, Anand; Ray, Stuart C.; Taylor, Casey Overby (JMIR Formative Research, 2022)