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We would like to thank all the authors who submitted their valuable contributions to this special issue. They provided both the reviewers and the editors, most importantly the readers, with a fascinating snapshot of the range of ongoing research in the area of RIS. We are equally grateful to all the reviewers, who were very responsive to our repeated reminders about staying on schedule. Their critical comments and suggestions to the authors contributed substantially to the quality of the issue. We are also indebted to Prof. Jian Song, ICN Editor-in-Chief, and the other editors in ICN editorial board for the encouragement they have provided.
This work is available under the CC BY-NC-ND 3.0 IGO license: https://creativecommons.org/licenses/by-nc-nd/3.0/igo/