[Q]: [Oftentakesafluctuating,chroniccourse,wherespontaneousregressionoflesionsmayoccur]
[A]: [Often takes a fluctuating, chronic course, where spontaneous regression of lesions may occur]
[Q]: [Theframeanduprightsareassembledwithfittingsandscrews.]
[A]: [The frame and uprights are assembled with fittings and screws.]
[Q]: [WhileatGöttingen,StruikmadefulluseoftheexcellentlibrarytheretostudytheRenaissancemathematiciansRies,Rudolff,Apianus,StifelandStevin.]
[A]:
[While at Göttingen, Struik made full use of the excellent library there to study the Renaissance mathematicians Ries , Rudolff , Apianus , Stifel and Stevin .]