APA

Goulart B. H. L., Ramsey S. D. & Parvathaneni U. (20140211). Observational study designs for comparative effectiveness research: an alternative approach to close evidence gaps in head-and-neck cancer. : International journal of radiation oncology, biology, physics.

Chicago

Goulart Bernardo H L, Ramsey Scott D and Parvathaneni Upendra. 20140211. Observational study designs for comparative effectiveness research: an alternative approach to close evidence gaps in head-and-neck cancer. : International journal of radiation oncology, biology, physics.

Harvard

Goulart B. H. L., Ramsey S. D. and Parvathaneni U. (20140211). Observational study designs for comparative effectiveness research: an alternative approach to close evidence gaps in head-and-neck cancer. : International journal of radiation oncology, biology, physics.

MLA

Goulart Bernardo H L, Ramsey Scott D and Parvathaneni Upendra. Observational study designs for comparative effectiveness research: an alternative approach to close evidence gaps in head-and-neck cancer. : International journal of radiation oncology, biology, physics. 20140211.