Informatics Challenges in Working with "Big Data" - A Use Case in Identifying Predictors of Constipation. - Fern FitzHenry; Svetlana K. Eden; Jason N. Denton; Robert J. LoCasale; Hui Cao; Aize Cao; Ruth M. Reeves; Nancy L. Wells; Michael E. Matheny (AMIA, 2016)