Which of the following statements about congenital dislocation of hip is true
- A: there''s dominant male to female preponderance
- B: it derives from altered intrauterine position
- C: early diagnosis is essential because early open surgery may result in good function
- D: the extremity with dislocation is shorter than the contralateral one
- E: for infant，or child with unstable but not dislocated hip，surgery may not be the first of choice
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