BC Injury Research and Prevention Unit (BCIRPU)
https://open.library.ubc.ca/media/stream/pdf/52387/1.0396344/5
Children's Hospital Colorado
https://www.youtube.com/watch?v=7fIrfwnns1U
Alexandra's Playground
https://www.youtube.com/watch?v=DJ2LmEYB_JQ
Seattle Children's Hospital
https://www.youtube.com/watch?v=75cqZkfvxKo