ostic-error-incid enceimpac ts-causes-and-preve ntive-strat egies 2 Graber ML. The incidence of diagnostic error in medicine. BMJ Qual Saf 2013; 22 Suppl 2: ii21-ii27.3 Chambers D, Cantrell AJ, Johnson M, et al. Digital and online symptom checkers and health assessment/triage services for urgent health problems: systematic review. BMJ Open 2019; 9: e027743. diagnoses by physicians: an exploratory analysis of data from a randomized controlled study.