Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Bernd Gruber <bernd.gruber@canberra.edu.au>’
  
  Found the following (possibly) invalid DOIs:
    DOI: 10.1111/1755-0998.12745
      From: inst/CITATION
      Status: 500
      Message: Internal Server Error
    DOI: 10.1111/1755-0998.13844
      From: man/EYR.Rd
            man/LBP.Rd
            man/YTH.Rd
      Status: 500
      Message: Internal Server Error
    DOI: 10.1111/2041-210X.13918
      From: inst/CITATION
      Status: 500
      Message: Internal Server Error

No changes to worse in reverse depends.