We excluded exposures occurring 2, 10, or 20 years before the reference date.
Therefore each analysis was repeated for exposures beginning at least 10 years before the reference date.
Only persons who had used cART for >1 month before the reference date were classified as users.
Eight cases and 16 controls had had radiotherapy to the skull 10 or more years before the reference date.
In their studies, Hardell and colleagues disregarded mobile and cordless phone use within the last year before the reference date.
Ever use was defined as regular use of any NSAID type at any point in time before the reference date.
Never users reported no use or less than the defined regular use threshold before the reference date.
Never users reported no use or less than the defined ever use threshold before the reference date.
Menopausal status was defined as postmenopausal if the subject reported natural menopause or bilateral oophorectomy before the reference date.
Women who reported natural amenorrhea 6 months before the reference date or bilateral oophorectomy were considered postmenopausal and hence not included in the analysis.
The exposure period was the year preceding recruitment (AUS, HAW, MAL, NEC, NJO and SON) or the time period approximately four years before the reference date (DOV).
