This is how I did it on my CV. I used professor and grad student CVs as a template. Most clinical faculty will have their CVs posted online that you can easily look over for examples.
2008-2010 Research Assistant, Project Name
Faculty Supervisors: Faculty names
This 2 year project was funded by ______ and was conducted in 2 phases: phase 1 involved interviews to assess sexual risk factors of Black young women who have sex with women and phase 2 involved the creation of an HIV/AIDS prevention curriculum based on the ______ curriculum and its pilot test
• Assisted with study design, data management, and data analysis
• Assisted with the design and creation of an HIV/AIDS, STI and pregnancy prevention intervention aimed at Black young women who have sex with women
• Transcribed interviews with Black young women who have sex with women
• Helped with training facilitators to deliver intervention
Note: I edited out specifics but you get the general idea. I guess you can also add the months you worked. Hope this helps!