@article {14293, title = {Examining user roles in social Q\&A: The case of health topics in Zhihu. com}, journal = {Proceedings of the Association for Information Science and Technology}, volume = {53}, year = {2016}, pages = {1-6}, publisher = {Wiley Online Library}, isbn = {2373-9231}, author = {Wang, Zhe and Zhang, Pengyi} }