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.”