To describe the natural history of a condition or disease. To describe the natural history of a condition or disease. To determine effectiveness or cost effectiveness of treatments/services and/or health care products. To measure or monitor safety and harm. To measure quality of care.
According to the NMSS, attacks or flare-ups of symptoms only qualify as exacerbations if: 1  they occur at least 30 days from an earlier flare-up. 2  symptoms last for 24 hours or longer.
Cosmopolitan.com Within the hour it took Piret to give me wow brows, I asked her a ton of questions, one of which was how long will this last? She told me that the results usually last around one to three years, and that I wouldn't need a touch-up for 12 months (though after four weeks, you do go in for a touch-up, which is included in the initial price of $900, to make sure you're happy).