[THE SUBTRACTION METHOD. APPLICATION TO RADIOGRAPHY IN ORL].
D006801:Humans; D009305:Nasopharynx; D010036:Otolaryngology; D011859:Radiography
NASOPHARYNX; OTORHINOLARYNGOLOGY; RADIOGRAPHY
LA M'ETHODE DE SOUSTRACTION. APPLICATION 'A LA RADIOGRAPHIE EN O.-R.-L.