You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Risk factors for Placenta Accreta include all of the following, except: and explain in detail?
In placenta accreta, there is a failure of normal decidua to form which causes the placenta to be directly anchored to the myometrium either paially or completely without any intervening decidua. Placenta prae in the present pregnancy is a risk factor for placenta accreta but previous placenta prae is not a risk factor. Ref: Manual of Pathology of the Human Placenta By Rebecca N. Baergen, Ku Benirschke; 2nd edition, Pages 192-97; Dutta textbook of Obstetrics 6th edition, Pages 420-21