Posture correctors

Do posture corrects actually help improve posture or is it all rubbish ? I refer to any number of the things listed here:

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https://www.google.co.uk/search?q=posture+corrector&rlz=1C1CHBF_en-GBGB789GB789&source=lnms&tbm=isch&sa=X&ved=0ahUKEwidteGH7IjfAhUsKMAKHXuhB5UQ_AUIDygC&biw=1920&bih=969

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submitted by /u/krumn
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