APA Citation

Wolfson, J., & Henn, L. (2014). Hard, harder, hardest: Principal stratification, statistical identifiability, and the inherent difficulty of finding surrogate endpoints. BioMed Central.

Chicago Style Citation

Wolfson, Julian, and Lisa Henn. Hard, Harder, Hardest: Principal Stratification, Statistical Identifiability, and the Inherent Difficulty of Finding Surrogate Endpoints. BioMed Central, 2014.

MLA Citation

Wolfson, Julian, and Lisa Henn. Hard, Harder, Hardest: Principal Stratification, Statistical Identifiability, and the Inherent Difficulty of Finding Surrogate Endpoints. BioMed Central, 2014.

Warning: These citations may not always be 100% accurate.