The investigator will issue a Patient Information Consent for the participant in the study. 1.Patients will be asked to complete the Reflux Symptom Index questionnaire. Clinical survey, medical history. 2. Objective methods for assessing the patient's condition: \- examination of ENT organs. 3. Laboratory and instrumental research methods: Endoscopic laryngoscopy and video laryngoscopy, pH-metry, acoustic voice analysis. 4.Sociological method. 5. Subjective methods for assessing the condition of the larynx. 6. Аnalysis of the received data
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Acidity level of the main group, Week 0
Timeframe: at the inclusion to the study
Acidity level of the control group 1, Week 0
Timeframe: at the inclusion to the study
Acidity level of the control group 2, Week 0
Timeframe: at the inclusion to the study
"Index of reflux symptoms" of the main group, Week 0
Timeframe: at the inclusion to the study
"Index of reflux symptoms" of the control group 1, Week 0
Timeframe: at the inclusion to the study
"Index of reflux symptoms" of the control group 2, Week 0
Timeframe: at the inclusion to the study
Endoscopic laryngoscopy of the main group, Week 0
Timeframe: at the inclusion to the study
Endoscopic laryngoscopy of the control group 1, Week 0
Timeframe: at the inclusion to the study
Endoscopic laryngoscopy of the control group 2, Week 0
Timeframe: at the inclusion to the study
Acoustic voice analysis of the main group, Week 0
Timeframe: at the inclusion to the study