| http://www.w3.org/ns/prov#value | - Of the 58 patients, 47 were continuously followed up for 4 years, including 27 male and 20 female patients aged between 26 and 73 years, with an average of 51.7 years old: 9 patients accepted single-segment surgery; 29 accepted double-segment surgery; and the rest 9 patients accepted 3-segment surgery.
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