RT Article T1 Purchaser licensing, point-of-sale background check laws, and firearm homicide and suicide in 4 US states, 1985-2017 JF American journal of public health VO 110 IS 10 SP 1546 OP 1552 A1 McCourt, Alexander D. A2 Webster, Daniel W. A2 Wintemute, Garen J. A2 Kagawa, Rose M.C. A2 Vernick, Jon S. A2 Stuart, Elizabeth A2 Crifasi, Cassandra LA English YR 2020 UL https://krimdok.uni-tuebingen.de/Record/1912671271 DO 10.2105/AJPH.2020.305822