Fig 1.tif (687.23 kB)
Flowchart of sample selection trough telephone interview.
figure
posted on 2017-09-21, 17:39 authored by Yaming Zheng, Mark Jit, Joseph T. Wu, Juan Yang, Kathy Leung, Qiaohong Liao, Hongjie YuFlowchart of sample selection trough telephone interview.