RT Journal Article SR Electronic T1 Re: Identifying Problematic Substance Use in a National Sample of Adolescents Using Frequency Questions JF The Journal of the American Board of Family Medicine JO J Am Board Fam Med FD American Board of Family Medicine SP 152 OP 152 DO 10.3122/jabfm.2020.01.190300 VO 33 IS 1 A1 Zeleznik, Jeffrey YR 2020 UL http://www.jabfm.org/content/33/1/152.1.abstract AB