Article,

Research study designs: experimental and quasi-experimental.

, and .
Air medical journal, 25 (6): 242-6 (2006)6722<m:linebreak></m:linebreak>JID: 9312325; ppublish;<m:linebreak></m:linebreak>Disseny; Recursos/Organització; Recerca clínica; Introductori.
DOI: 10.1016/j.amj.2006.09.001

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