While this video is in German, click here for an English translation (video and text).  Dr. Margarite Griesz-Brisson delivers her professional assessment of the dangers of wearing face masks:  (excerpt) I do not wear a mask, I need my brain to think. I want to have a clear head when I deal with my patients, and not be in a carbon dioxide-induced anaesthesia. 

There is no unfounded medical exemption from face masks because oxygen deprivation is dangerous for every single brain.  It must be the free decision of every human being whether they want to wear a mask that is absolutely ineffective to protect themselves from a virus.