We observed a single associated disease in 1,793 (38.0%) of the cases, 2 diseases in 1,505 (32.0%), 3 in 797 (16.9%), 4 in 349 (7.4%) and 5 diseases in 184 (3.9%) of the cases. A diagnosis could not be determined after autopsy in 82 (1.7%) of the cases.