The primary outcome assessed will be improvement in olfaction (periods 4; 12; 24 and 52 weeks after starting treatment). The evaluation of smell is based on the comparison of results from before and after the olfactory rehabilitation obtained from a single method of the two methods: olfactory identification results obtained from the University of Pennsylvania Smell Identification Test (UPSIT); Subjective assessment of patients using a visual analogue scale for the following complaints: loss of ability to smell; loss of ability to sense flavors; nasal symptoms in the last 14 days; how much the difficulty in smelling bothers; how much the difficulty in feeling flavors bothers.

The primary outcome assessed will be improvement in olfaction (periods 4; 12; 24 and 52 weeks after starting treatment). The evaluation of smell is based on the comparison of results from before and after the olfactory rehabilitation obtained from a single method of the two methods: olfactory identification results obtained from the University of Pennsylvania Smell Identification Test (UPSIT); Subjective assessment of patients using a visual analogue scale for the following complaints: loss of ability to smell; loss of ability to sense flavors; nasal symptoms in the last 14 days; how much the difficulty in smelling bothers; how much the difficulty in feeling flavors bothers.