Factors associated with the availability of virtual consultations in primary care across 20 countries: cross-sectional study - Kerr, Gabriele; Greenfield, Geva; Li, Edmond; Beaney, Thomas; Hayhoe, Benedict W. J.; Car, Josip; Claveria, Ana; Collins, Claire; Gusso, Gustavo Diniz Ferreira; Hoffman, Robert D. (Journal of Medical Internet Research, 2025)