Unsupervised machine learning to investigate trajectory patterns of COVID-19 symptoms and physical activity measured via the MyHeart Counts App and smart devices. - Varsha Gupta; Sokratis Kariotis; Mohammed D. Rajab; Niamh Errington; Elham Alhathli; Emmanuel Jammeh; Martin Brook; Naomi Meardon; Paul Collini; Joby Cole; Jim M. Wild; Steven Hershman; et al. (npj Digit. Medicine, 2023)