المؤلفون: Sipsma, Heather L, Falb, Kathryn L, Willie, Tiara, Bradley, Elizabeth H, Bienkowski, Lauren, Meerdink, Ned, Gupta, Jhumka

المصدر: BMJ Open ; volume 5, issue 4, page e006299 ; ISSN 2044-6055 2044-6055

الاتاحة: http://dx.doi.org/10.1136/bmjopen-2014-006299
https://syndication.highwire.org/content/doi/10.1136/bmjopen-2014-006299