Original sentence: Rarely, paddling can cause injury if not applied correctly
Edited sentence: It has been estimated that, as a result of such injuries, 10,000 to 20,000 students seek medical treatment each year.Paddling can cause various kinds of physical injuries.Students suffer such injuries as abnormal vaginal bleeding, "abrasions, severe muscle injury, extensive hematomas, whiplash damage, life-threatening fat hemorrhage, and others (including death)"