Correction: Design and rationale of the Cardiovascular Health and Text Messaging (CHAT) Study and the CHAT-Diabetes Mellitus (CHAT-DM) Study: two randomised controlled trials of text messaging to improve secondary prevention for coronary heart disease and diabetes

Huo X, Spatz ES, Ding Q, et al. Design and rationale of the Cardiovascular Health and Text Messaging (CHAT) Study and the CHAT-Diabetes Mellitus (CHAT-DM) Study: two randomised controlled trials of text messaging to improve secondary prevention for coronary heart disease and diabetes. BMJ Open 2017;7:e018302. doi: 10.1136/bmjopen-2017-018302

The equal contributors statement should read: "XH and ESS are Joint first authors. HMK and LJ are Joint senior authors."

The 'Contributions' section at the end of the paper should read: "ESS, XZ, MLI, JL, XL, LJ, JAS, FAM, HMK, LJ: study concept and design; All authors except XY, HZ are involved in designing the study text messages; XH, XZ, HZ, XY, XL are involved in the implementation of the project; XH, ESS, QD, PH, CM drafting the initial manuscript. All authors provided critical revision of the paper, read and approved the final manuscript."

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