Theoretical training: The theoretical training covers the anatomy and physiology of the velopharyngeal region and nasal cavity, nasopharyngoscope, preparation of the patient for nasopharyngoscopy, use of the endoscope during nasopharyngoscopy and the procedure for nasopharyngoscopic velopharyngeal function assessment.

Practical training: At the beginning of the hands-on training, the device will be introduced to the participants. Basic information will be given about endoscopy device. Then, the principal investigator will give information about the use of the endoscope (patient instructions, holding the endoscope, placement of the endoscope in the nose, manipulation of the endoscope, anatomical structures in the nasal cavity and velopharyngeal region, velopharyngeal function assessment) on the 3D printed endoscopy training model. Participants will receive hands-on training on the 3D printed endoscopy training model, under the guidance of the principal investigator.

A 9-question perceptual survey was created to evaluate the participants' self-confidence and self-competence in performing nasopharyngoscopic velopharyngeal evaluation. The survey was adapted from a 5-point Likert-type survey previously used in simulation-based transnasal endoscopy training on swallowing assessment (Benadom & Potter, 2011).

This is the time from the moment the endoscope enters the nostril until it reaches the point of visualization of the velopharyngeal sphincter. This time does not include the time the endoscope is removed from the nose and reinserted.