Can we <i>S</i>ave the rectum by watchful waiting or <i>T</i>rans<i>A</i>nal microsurgery following (chemo) <i>R</i>adiotherapy versus <i>T</i>otal mesorectal excision for early <i>RE</i>ctal <i>C</i>ancer (STAR-TREC study)?: protocol for a multicentre, randomised feasibility study
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