1. Evaluation of Selection Bias in an Internet-based Study of Pregnancy Planners. Issue 1 (January 2016) Authors: Hatch, Elizabeth E.; Hahn, Kristen A.; Wise, Lauren A.; Mikkelsen, Ellen M.; Kumar, Ramya; Fox, Matthew P.; Brooks, Daniel R.; Riis, Anders H.; Sorensen, Henrik Toft; Rothman, Kenneth J. Journal: Epidemiology Issue: Volume 27:Issue 1(2016:Jan.) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗