© 2018 Zhejiang University and Chinese Association of Urban Management. Production and Hosting by Elsevier B.V. This is an openaccess article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)Except where otherwise noted, this item's license is described as © 2018 Zhejiang University and Chinese Association of Urban Management. Production and Hosting by Elsevier B.V. This is an openaccess article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)