?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Thygesen&rft.aufirst=Johan+H&rft.au=Thygesen%2C+Johan+H&rft.atitle=Prevalence+and+demographics+of+331+rare+diseases+and+associated+COVID-19-related+mortality+among+58+million+individuals%3A+a+nationwide+retrospective+observational+study&rft.volume=7&rft.date=February+2025&rft.title=The+Lancet+Digital+Health&rft.pages=e145-e156&rft.issn=2589-7500&rft.issue=2&rft.genre=article