PLoS ONE 2021, ' Characteristics of patients in platform C19, a COVID-19 research database combining primary care electronic health record and patient reported information ', PLoS ONE, vol. 16, no. 10, pp. e0258689 . https://doi.org/10.1371/journal.pone.0258689 Platform C19 committee 2021, ' Characteristics of patients in platform C19, a COVID-19 research database combining primary care electronic health record and patient reported information ', PLoS ONE, vol. 16, no. 10, e0258689 . https://doi.org/10.1371/journal.pone.0258689 PLoS ONE, Vol 16, Iss 10, p e0258689 (2021)