Co-rumination cultivates anxiety: a genetically informed study of friend influence during early adolescence
Developmental Psychology (2015) - Comment
pubmed: 25664832  doi: 10.1037/a0038848  issn: 1939-0599  issn: 0012-1649 

Shrija Dirghangi, Gilly Kahn, Brett Laursen, Mara Brendgen, Frank Vitaro, Ginette Dionne, Michel Boivin