Greetings from Dr. Chii-Ruey Lin, Dr. Wen-Han Chang and the Editorial Office of HT!
We are glad to present the 2019 Annual Report of HT here. In 2019, HT has made good progress under the join-efforts of experts worldwide. We would like to express sincere appreciation for the enthusiastic and vigorous support and contributions from all editorial board members, guest editors, authors, reviewers and readers. We wish you a happy, healthy and prosperous 2020!