法國法 醫療過錯 舉證責任 醫療科學上過錯 醫療倫理上過錯 方法債務 結果債務 醫療資訊義務 推定過錯 防禦性醫療 The French law Medical fault Burden of proof Fault on medical science Fault on medical ethics Method-obligation Result-obligation Duty of medical information Presumption of fault Defensive medicine