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(A) Receiver operating characteristic curve of intra-fractional variations (≥2 mm) of anterior-posterior and decrease of body weight or volume. (B) Receiver operating characteristic curve of intra-fractional variations (≥2 mm) of three-dimensional vector and decrease of body weight or volume. (C) Receiver operating characteristic curve of intra-fractional variations (≥2 mm) of any directions and decrease of body weight or volume.
