Hulley, Stephen B.
Choosing the study subjects : specification, sampling, and recruitment / Stephen B. Hulley, Thomas B. Newman, Steven R. Cummings
Choosing the study subjects : specification, sampling, and recruitment / Stephen B. Hulley, Thomas B. Newman, Steven R. Cummings Investigação clínica
Choosing the study subjects : specification, sampling, and recruitment / Stephen B. Hulley, Thomas B. Newman, Steven R. Cummings Investigação clínica
