Conception and design: Falagas, Konstantelias, Vardakas. Acquisition of data: Konstantelias, Polyzos. Analysis and interpretation of data: all authors. Drafting the article: Konstantelias, Polyzos, Tansarli. Critically revising the article: Vardakas. Reviewed submitted version of manuscript: all authors. Approved the final version of the manuscript on behalf of all authors: Falagas. Statistical analysis: Konstantelias, Vardakas, Tansarli. Administrative/technical/material support: Falagas. Study supervision: Falagas, Vardakas.
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