RESULTS
Of the 221 contacted patients, initially only 101 returned the questionnaire (response rate 45.7%). Patients who did not respond to the first attempt, were contacted again. This resulted in a rather disappointing 15 extra responders (final response rate 52.5%). Of 116 patients who filled out the questionnaire, 15 underwent a bilateral intervention or had – during follow-up – undergone more than 1 sialendoscopic intervention. A questionnaire was filled out for each procedure that was performed. This resulted in 146 long-term evaluable sialendoscopies of the total of 272 that were carried out during the study period.