<prompt> Cotton;s grading is used forSubglottic stenosisLaryngeal carcinomaSuperior nerve palsyVoice abuse  <response>: Subglottic stenosis is graded according to the Cotton-Myer classification system from one to four based on the severity of the blockage. Grade 1 - 50 obstruction Grade 2 - 51-70 obstruction Grade 3 - 71-99 obstruction Grade 4 - no detectable lumen Ref: Internet sources- Wikipedia 