TY  - GEN
AU  - Lederer,Susan E
TI  - The challenges of challenge experiments
SN  - 1533-4406
PY  - 2014///0902
KW  - Ethics, Research
KW  - history
KW  - Female
KW  - Healthy Volunteers
KW  - History, 18th Century
KW  - History, 20th Century
KW  - History, 21st Century
KW  - Human Experimentation
KW  - ethics
KW  - Humans
KW  - Male
KW  - Smallpox
KW  - Smallpox Vaccine
N1  - Publication Type: Historical Article; Journal Article
UR  - https://doi.org/10.1056/NEJMp1408554
ER  -