Another study of 30 homicide cases involving dismembered bodies over half a century by the department of forensic medicine in Kraków, Poland found that these murders were usually not planned, and were committed by offenders who were in "close relationship with victim (family or friend) in the same place as the killing - the home of the perpetrator". A separate study by the Boston University school of medicine showed that 76% of dismembered crimes were committed by men.