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Preferred Reporting Items for Systematic Review (PRISMA) flow chart—search strategy. Study designs comprised case reports, case series, retrospective and prospective studies, letters to the editors, and reviews. An appraisal based on titles and abstracts as well as a hand search of reference lists were carried out. The reference lists of all located articles were reviewed to detect still unidentified literature. A total of 81 studies fulfilled the inclusion criteria.
