Data collection
The baseline assessment at T0 was undertaken by the researchers, and participants were asked to complete the SICS, EPDS, PSSS and social-demographic and clinical data in the maternity wards. Post-intervention assessment at T1 was conducted immediately after the intervention, and follow-up assessment at T2 was carried out on 3 months after the intervention. The electronically questionnaires comprised of SICS, EPDS, and PSSS were sent to participants by WeChat or email at the two time points of T1 and T2; and the completed questionnaires of T1 and T2 were returned to the researchers likewise by WeChat or email. In order to decrease the non-response rate, a reminder telephone or WeChat was given to participants before and after 1 week of the two time points, respectively. All collected data were kept confidentially.