What are your dose constraints for lung (V20, V5, MLD, etc.) in patients receiving postoperative radiation therapy after lobectomy?

It's recommended to use the LUNG-ART protocol for post-op cases. They utilized the Graham data for V20, but because there was no data for post-op cases where patients don't have part of their lungs, they just modified the contstraint to V20 < 31% for patients treated with lobectomy and V20 < 22% for...