Epidemiology
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The extent to which helmet use reduces the risk of injury in ski- and snowboard-related accidents is unclear. We studied the association of helmet use with injuries of the head, face, and neck among skiers and snowboarders involved in falls and collisions. ⋯ Helmets may provide some protection from head injury among skiers and snowboarders involved in falls or collisions.
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Although the protective effect of oral contraceptives (OCs) use against epithelial ovarian cancer is well-established, there remain gaps in our understanding of the contributions of time-related characteristics of OC use to risk. ⋯ Reduction in epithelial ovarian cancer risk associated with OC use became apparent after a short latency period and short duration of use, and was long-lasting. Time since first use and time since last use seem to modify the association of OCs with ovarian cancer risk independently of duration of use.