Randomization
BLIND
The generation of random allocation sequence was done by an independent statistician at the University of Liverpool, who was not involved in the enrolment of participants in the trial. Simple numbers were provided to the local Principal Investigator (PI) through mail who assigned the participants to THP-BGV or Treatment as Usual. Randomization was performed after the baseline assessments were completed. The site coordinator was informed of the allocation status, and contacted both the participants and the designated nurse to inform them of the randomization outcome. The pregnancy school nurses and the participants were requested not to discuss their treatment allocation with the assessment team while completing the post-intervention and follow-up assessments. Other than outcome assessors, it was not possible to blind antenatal nurses in participating centers. Blinding for the participants was not possible because they can easily predict the allocated assignment due to the longer duration of the intervention sessions.