When results from clinical trials are different from observational studies.

Authors

• Wen, Shi Wu, Wen SW, Ottawa Hospital Research Institute, Ottawa, Canada; School of Epidemiology and Public Health, University of Ottawa, Ottawa, Canada; Department of Obstetrics and Gynecology, University of Ottawa, Ottawa, Canada. Electronic address: swwen@ohri.ca.

• Zeng, Na, Zeng N, Ottawa Hospital Research Institute, Ottawa, Canada; School of Epidemiology and Public Health, University of Ottawa, Ottawa, Canada.

• Krewski, Daniel, Krewski D, School of Epidemiology and Public Health, University of Ottawa, Ottawa, Canada; Department of Obstetrics and Gynecology, University of Ottawa, Ottawa, Canada; Risk Sciences International, Ottawa, Canada.

• Walker, Mark C, Walker MC, Ottawa Hospital Research Institute, Ottawa, Canada; School of Epidemiology and Public Health, University of Ottawa, Ottawa, Canada; Department of Obstetrics and Gynecology, University of Ottawa, Ottawa, Canada; International and Global Health Office, University of Ottawa, Ottawa, Canada; BORN Ontario, Children's Hospital of Eastern Ontario, Ottawa, Canada.