What criteria do you use for choosing (or, pointedly, not choosing) parotid sparing with IMRT in patients with bilateral neck nodal disease from a mucosal head and neck cancer?

When I prepared for our oral board exam, we knew that certain examiners felt that patients with bilateral neck disease were not true candidates for parotid sparing IMRT. You may have had to back down on IMRT with certain examiners and say that there wasn't a strong rationale for treating with that t...