Age of alcohol and cannabis use onset mediates the association of transmissible risk in childhood and development of alcohol and cannabis disorders: evidence for common liability
Experimental and Clinical Psychopharmacology (2013) - Comment
pubmed: 23205723  doi: 10.1037/a0030742  issn: 1936-2293  issn: 1064-1297 

Levent Kirisci, Ralph Tarter, Ty Ridenour, Zu Wei Zhai, Diana Fishbein, Maureen Reynolds, Michael Vanyukov