Percentage of correct answers about the symptoms given by the GPs.

<p>a) Percentage of correct symptoms from the four different catagories given by GPs with less than 20 years of work experience. b) Percentage of correct symptoms from the four different catagories given by GPs with more than 20 years of work experience. (1) presence of tumour mass in the nasopharynx; (2) dysfunction of the eustachian tube, associated with the lateroposterior extension of the tumour to the paranasopharyngeal space; (3) skull-base erosion and palsy of the fifth and sixth cranial nerves, associated with the superior extension of the tumour; (4) neck masses.