Literature search
Literature search on application of HIFU in management of PAS was conducted. Scopus, Cochrane, PubMed and Web of Science databases were searched for relevant articles using the following terms: [“focused ultrasound” OR “ultrasound ablation”] AND [“placenta accreta” OR “placenta percreta” OR “Placenta increta”], from the date of database inception to January, 31st 2020. References from eligible articles were screened for other related articles. For purpose of comparison to other uterus-conserving techniques, studies were retrieved from CON-PAS registry, an online open access registry of studies on conservative management of PAS in the last 20 years, which is provided by Middle-East Obstetrics and Gynecology Graduate Education (MOGGE) Foundation (17). The registry was last updated in April 2020.