This allows for requests to
(with optional path-prefix "/api"):

* POST /{usecase}
* POST /{usecase}/etl/patient-record => as DNPM:DIP

* DELETE /{usecase}/{ID}
* DELETE /{usecase}/etl/patient-record/{ID}
* DELETE /{usecase}/etl/patient/{ID} => as DNPM:DIP

Where {usecase} is one of:

* mtbfile
* mtb => as DNPM:DIP

This might occur if a null value is present in the list of MSI findings.

With this change, the usage if "it" has been replaced with proper element names.

This should ensure correct anonymization because some cases of
non-resolvable references have been observed in previous runs.