End stage clinical features and cause of death of behavioral variant frontotemporal dementia and young-onset Alzheimer’s disease Manuscript Number: 20-0337R2 Author(s): Annemieke Dols, Flora T. Gossink, Jan R.A. Meursing, Yolande A.L. Pijnenburg, Philip Scheltens, Lieke S. de Vijlder, Marie-Paule E. van Engelen