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The text messages were developed based on behavioural change techniques, using models such as the information-motivation-behavioural skills model, goal setting and provision of social support.A total sample size of 800 patients would be adequate for CHAT Study and sample size of 500 patients would be adequate for the CHAT-DM Study.In CHAT, patients were eligible if they had established CHD defined as a history of AMI and/or percutaneous coronary intervention, access to a mobile phone to read and send text messages, and did not have diabetes.

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Participants were randomly allocated to either the intervention or the control arms in a 1:1 ratio using a computerised randomisation system.

In order to achieve a balance of participants’ characteristics in both arms, we employed a stratified randomisation approach, based on age, gender, AMI history, education degree and medical insurance type within each study.

In both studies, patients were excluded if they could not read or send text messages, had cognitive or communication disorders, or could not provide informed consent.

A ‘screening log’ of basic demographic information and reasons for not participating in patients deemed ineligible or declined to participate has been recorded.

The recruitment was completed in April 2017, and the last follow-up visit is expected to finish in October 2017.

All participants provided written informed consent at the initial trial visit.

Patients were recruited from 37 hospitals across 17 provinces in China (figure 1, online supplementary material 1).

The enrolment of participants began on 16 August 2016.

Results will be disseminated via usual scientific forums including peer-reviewed publications.

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