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. 2018 Mar 19;12:156. doi: 10.3389/fnins.2018.00156

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Copyright © 2018 Wang, Li, Luo, Ma, Fu and Fu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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FR results. The rates of giving five-stars for the factors of coupon strategy (RI vs. RN) and product quality (slightly defective products vs. seriously defective products vs. not defective products). ^*p < 0.05, ^***p < 0.001.