I think that in case of cancer screenings people in the demographic age group at risk, get a notification to get tested and sometimes if they want to participate in a scientific study about this.
So maybe it's an option that GP's send a request to participate in the study to all patients in their registry that have a diagnosis of ME/CFS? Or would that be a violation of those people's privacy?
I got recruited into the UK ME/CFS Biobank that way. They asked my GP practice to send a letter out to the patients on their register with an ME/CFS diagnosis
But that was before GDPR - not sure whether they are still allowed to target patients in this way.
I wasn't engaged with the patient community at the time, so I was happy to hear about a study that I could participate in.
I think lots of ME patients would be happy to receive a letter invite from their GP surgery if GDPR would allow for this method, because most patients get told there's nothing much that can be done to help them. So being invited to help with scientific research offers something practical you can do towards a possible future medication or cure.
I think recruiting through primary care would also send the message that ME is important - important enough for scientists to want to sequence our genomes!
I know my GP, whose wife is a geneticist, would be supportive of the idea.
The only thing I don't know is whether that method of recruiting is still permitted under GDPR, but I expect the researchers would know, and the GP practices would know, so should be easy to find out.