Yes the doctor who oversaw my treatment pioneered the treatment and is the thought leader in the field.
You can read her various papers[1]. I've read many things about ADHD and functioning mechanics of the brain. This is by far the most substantive and practical resource of info that I managed to put to go use when I trained my brain.
I think i will try to find a place similar to yours in Scandinavia but want the quality to be right.
Alternatively i am thinking if consumer EEG electrodes are good enough at this time to create a personal setup.