Confounding by Indication in Clinical Research.
Departments of Emergency Medicine and Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois2Senior Editor, JAMA.
Demetrios N
DN
Kyriacou
Department of Emergency Medicine, Harbor-UCLA Medical Center and David Geffen School of Medicine at UCLA, Los Angeles, California.
Roger J
RJ
Lewis
D015982:Bias; D035843:Biomedical Research; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D012107:Research Design