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patients who have difficulty with invasive examinations; 3. Assessing fetal head station and labor progress by measuring the head-perineal distance (HPD) and the angle of progression (AOP); 4. Estimating the pelvic size relative to the fetal head by measuring the pubic arch angle and fetal head circumference; 5. Predicting the mode of delivery before and during the labor process; 6. Prior to deciding the mode of delivery in a prolonged second stage of labor; 7. Providing a visual biofeedback to improve pushing efforts and mother-baby co