APA (7th ed.) Citation

P, S., & LP, G. (2012). Retrospective outcomes studies for orphan diseases: Challenges and opportunities. Current Medical Research & Opinion, 28(4), 665.

Chicago Style (17th ed.) Citation

P, Sun, and Garrison LP. "Retrospective Outcomes Studies for Orphan Diseases: Challenges and Opportunities." Current Medical Research & Opinion 28, no. 4 (2012): 665.

MLA (9th ed.) Citation

P, Sun, and Garrison LP. "Retrospective Outcomes Studies for Orphan Diseases: Challenges and Opportunities." Current Medical Research & Opinion, vol. 28, no. 4, 2012, p. 665.