Have posted this over on the Pernicious Anaemia Society forum.
However, it obviously is of significance to many here and the "patient forums" bit might be of general, widespread interest.
I'm not re-posting here so that any comments can (hopefully) stay together on my PAS forum post (or, if anyone else has posted it, on their posts).
Examining the Diagnosis and Treatment Experiences of People Living With Autoimmune Gastritis and Pernicious Anemia
Publication date - yesterday.
I haven't read it all but it looked to be relevant and potentially of interest. And is open access.
Note that it specifically discusses patient disempowerment and patient forums.