* age of less than 18 years * pregnancy or lactation * unwillingness to use effective contraception during the participation in the trial * use of concomitant medication that prolongs the qt interval * allergy or contraindication to hydroxychloroquine * retinopathy or maculopathy * neuromuscular diseases (i.e myasthenia gravis, parkinson's disease) * g6pd deficiency

* age of less than 18 years * pregnancy or lactation * unwillingness to use effective contraception during the participation in the trial * use of concomitant medication that prolongs the qt interval * allergy or contraindication to hydroxychloroquine * retinopathy or maculopathy * neuromuscular diseases (i.e myasthenia gravis, parkinson's disease) * g6pd deficiency

- age of less than 18 years - pregnancy or lactation - unwillingness to use effective contraception during the participation in the trial - use of concomitant medication that prolongs the qt interval - allergy or contraindication to hydroxychloroquine - retinopathy or maculopathy - neuromuscular diseases (i.e myasthenia gravis, parkinson's disease) - g6pd deficiency

- age of less than 18 years - pregnancy or lactation - unwillingness to use effective contraception during the participation in the trial - use of concomitant medication that prolongs the qt interval - allergy or contraindication to hydroxychloroquine - retinopathy or maculopathy - neuromuscular diseases (i.e myasthenia gravis, parkinson's disease) - g6pd deficiency