Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve content/pdf/10.1007/s10354-020-00798-3.pdf, which is not a DOI.
content/pdf/10.1007/s10354-020-00798-3.pdf may be a Handle (DOIs are a special sort of Handle). If content/pdf/10.1007/s10354-020-00798-3.pdf is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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