Effects of a flexibly delivered group-based acceptance and commitment therapy on reducing stress and enhancing psychological wellbeing in parents of school-age children during the COVID-19 pandemic: a quasi-experimental study - Mak, Yim-Wah; Leung, Doris Y. P.; Zhang, Xuelin; Chung, Joyce O. K.; Chow, Petsy S. Y.; Ruan, Jiayin; Yeung, Jerry W. F. (Frontiers in Public Health, 2024)