I purchased this book a few weeks ago and I'm currently trawling through it. The book is full of case studies from doctors 50 years experience of working in the NHS. The doctor in question who I will not say the name of here is 72 years old.
I would truly recommend purchasing the document, it's author has tried to keep the price as low as possible circa £6
The book b12 deficiency in clinical practice is available from Amazon and it goes into all the potential misdiagnosis which can ultimately be attributed to b12 deficiency examples include Ms m e fibromyalgia dementia
Happy reading