Methods of Covariate Selection: Directed Acyclic Graphs and the Change-in-Estimate Procedure.
Hsin-Weng, Yi; Ya-Hsueh, Hui; Messam, Locksley L. McV.; Hertz-Picciotto, Irva; American Journal of Epidemiology, 2009, vol. 169, issue 10, p 1182, ISSN 00029262. ISBN 00029262.

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