Zeng , Y , Navarro , P , Xia , C , Amador , C , Fernandez-Pujals , A M , Thomson , P A , Campbell , A , Nagy , R , Clarke , T-K , Hafferty , J D , Smith , B H , Hocking , L J , Padmanabhan , S , Hayward , C , MacIntyre , D J , Porteous , D J , Haley , C S & McIntosh , A M 2016 , ' Shared Genetics and Couple-Associated Environment Are Major Contributors to the Risk of Both Clinical and Self-Declared Depression ' , EBioMedicine , vol. 14 , pp. 161-167 . https://doi.org/10.1016/j.ebiom.2016.11.003