Pragmatic randomised trials using routine electronic health records: putting them to the testTjeerd van Staa, Liam Smeeth, Brendan Delaney et al.|BMJ|2012Cited by 172
Prevalence of orthostatic intolerance in long covid clinic patients and healthy volunteers: A multicenter studyCassie Lee, Manoj Sivan, Darren C. Greenwood et al.|Journal of Medical Virology|2024Cited by 22
Prevalence of orthostatic intolerance in Long Covid clinic patients: A multicentre observational studyCassie Lee, Manoj Sivan, Darren C. Greenwood et al.|medRxiv|2023Cited by 1