1. Databases for Clinical Research
Katrina Abuabara, David J. Margolis 
Journal of Investigative Dermatology 
Volume 135, Issue 8, Pages 1-4 (August 2015)
DOI: /jid
Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

2. Figure 1
Common epidemiologic study designs RCT, randomized controlled trial.
Journal of Investigative Dermatology  , 1-4DOI: ( /jid )
Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

3. Journal of Investigative Dermatology 2015 135, 1-4DOI: (10. 1038/jid
Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

4. Journal of Investigative Dermatology 2015 135, 1-4DOI: (10. 1038/jid
Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions