Tracking Assault-injured, Drug-using Youth in Longitudinal Research: Follow-up Methods. Nov 20, 2018 Tracking Assault-injured, Drug-using Youth in Longitudinal Research: Follow-up Methods. Roche JS, Clery MJ, Carter PM, Dora-Laskey A, Walton MA, Ngo QM, Cunningham RM. Tracking assault-injured, drug-using youth in longitudinal research: Follow-up methods. Acad Emerg Med. 2018 Oct 31. doi: 10.1111/acem.13495. PMID: 30381864.