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Ultrasound in Obstetrics & Gynecology > 55 > 3 > 318 - 325
Ultrasound in Obstetrics & Gynecology > 55 > 3 > 332 - 338
Ultrasound in Obstetrics & Gynecology > 55 > 2 > 189 - 197
Ultrasound in Obstetrics & Gynecology > 53 > 2 > 175 - 183