Interpretation of observational studies.

Polychronopoulou A Professor, Department of Preventive & Community Dentistry, School of Dentistry, University of Athens, Athens, Greece.
Pandis N Private practice, Corfu, Greece; visiting assistant professor, Department of Orthodontics and Dentofacial Orthopedics, School of Dental Medicine/Medical Faculty, University of Bern, Bern, Switzerland.

Published in:

American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics. - 2014