Figure 3From: The effects of organic nitrates on osteoporosis: a randomized controlled trial [ISRCTN94484747]Design of the main trial. *The main trial will be preceded by a one week nitrate run-in phase. Subjects who do not develop headaches during the run-in phase will then enter the main trial. The main trial consists of a 3 month pre-treatment phase with calcium and vitamin D. At 3 months subjects are randomized to treatment of placebo.Back to article page