One was done in MS...My pulmonologist said the data has gone in but there results are pending. It sounds as though you may have received "it." I certainly hope so. Had not heard of the liquid nitrogen studies but will begin my research on it and then call my Pulmonologist. The valves have been wonderful......its the bronchial secretions that keep me from being all that I can be regardless of a strict pulmonary hygiene program, currently on a pulmonary rehab program but not impressed. I think I would do better in a gym with an experienced trainer for strength and conditioning. My PFT's showed a good improvement post valve insertion however had a set-back due to a medication that was causing vertigo, dizziness etc almost daily. Finally I ID'ed it and came off of it and haven't been dizzy since. Won't bor you further. Just nice to chat with someone who is clinically savvy......Best of Luck!