?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Trnacevic&rft.aufirst=A&rft.au=Trnacevic%2C+A&rft.atitle=COVID-19+in+Northeast+Bosnia+and+Herzegovina+and+patient%E2%80%99s+length+of+hospitalization&rft.volume=21&rft.date=2021&rft.title=BMC+Infectious+Diseases&rft.issue=1&rft.genre=article