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Measurements of internal and external pelvic parameters. (A) Internal pelvic parameters: distance promontory – symphysis (mm), P = 0.12 (left); distance between the ischial spines (mm), P = 0.2 (right). (B) External pelvic parameters: distance between the anterior superior iliac spines (mm), P = 0.38 (left); distance between the anterior inferior iliac spines (mm), P = 0.03 (right).
