The authors regret that there was a mistake in the affiliation of the corresponding author in the originally published article. The correct affiliation is as below:

School of Architecture and Urban Planning, Huazhong University of Science & Technology, South block 4-303, Luoyu Road 1037, Wuhan 430074, Hubei, PR China

The authors would like to apologise for any inconvenience caused.

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Published on 12/05/17
Submitted on 12/05/17

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