By an odd coincidence the SPR Facebook page has a link to a paper by Karina Stengaard Kamp and Helena Due entitled "How many bereaved people hallucinate about their loved one? A systematic review and meta-analysis of bereavement hallucinations", in press in the Journal of Affective Disorders:
https://www.sciencedirect.com/science/ar...2718301551
https://www.sciencedirect.com/science/ar...2718301551