A national hospital discharge database could be the best source yet in tracking gun-related injuries in the United States, says a new study. Researchers say information from a database called the Nationwide Inpatient Sample (NIS), which is part of a federal data collection effort, can provide details on everything from length of stay, hospital procedures, outcomes and costs. In looking at NIS data from more than 1,000 hospitals in 22 states reported for the year 1997,... (GunPolicy.org)