Similarly, in the validation group, NRIs at different time points showed a positive trend with values ranging from 0.73 to 0.94 (95 % CI = 0.82), 0.64–096 (95 % CI = 0.77), and finally reaching a range of 0.60–0.98 (95 % CI = 0.78) at year intervals of three, six and nine years respectively (P < 0.05).
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A prognostic model and novel risk classification system for radical gallbladder cancer surgery: A population-based study and external validation.
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