2015 APHA Annual Meeting & Expo

Home Events & Meetings Annual Meeting Schedule & Program

Recorded Annual Meeting Presentations (RAMP) are now available for purchase.
Only $90 for presenters, $140 for registered attendees and $200 for non-attendees.

Online Program

Sijia Yang

PhD student
University of Pennsylvania
Philadelphia, PA
USA syang@asc.upenn.edu

5075.0 Efficacy and Causal Mechanism of an Online Social Network Intervention to Increase Physical Activity