Decreased olfactory (anosmia and hyposmia) or olfactory change (phantom or crocosmia) after Covid 19 infection (infection detection method is recorded in the data entry form) At least 3 months have passed since the onset of olfactory disorder.

Decreased olfactory (anosmia and hyposmia) or olfactory change (phantom or crocosmia) after Covid 19 infection (infection detection method is recorded in the data entry form) At least 3 months have passed since the onset of olfactory disorder.