Pei-Yun Chen

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In designing longitudinal studies, researchers must determine the number of subjects to randomize based on the power to detect a clinically meaningful treatment difference and a proposed analysis plan. In this paper, we present formulas for sample size estimation and an assessment of statistical power for a two-treatment repeated measures design allowing(More)
OBJECTIVE To compare the safety and efficacy of rofecoxib* to naproxen for the treatment of juvenile rheumatoid arthritis (JRA). METHODS This was a 12-week, multicenter, randomized, double-blind, double-dummy, active comparator-controlled, non-inferiority study with a prespecified 52-week open-label active comparator-controlled extension. Children (ages(More)
We report a 27-year-old male who presented with headache and rapid visual impairment. He had been diagnosed with venous sinus thrombosis 3 months earlier, when he had diffuse headache, nausea and vomiting, which subsided after incomplete thrombolytic therapy. Warfarin was then prescribed without screening for coagulopathy. Ophthalmic examination revealed(More)
McLeod syndrome is one subtype of rare neuroacanthocytosis syndromes characterized by misshapen red blood cells and progressive degeneration of the basal ganglia. It is an X-linked recessive disorder with mutation in the XK gene of the Kell blood group system with multisystem involvements. Concerning the movement disorders, its dyskinesias are various and(More)
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