Elsevier hepcrawl: parser parses twice the same affiliation

[ErnestaP]

XML file has the same affiliation mentioned twice:

 <ce:affiliation id="aff0760"
                        affiliation-id="S0370269323005798-47d5dbba09b0bd9431eed98216197c7a">
                        <ce:label>bz</ce:label>
                        <ce:textfn>University of Turin and INFN, I-10125, Turin, Italy</ce:textfn>
                        <sa:affiliation>
                            <sa:organization>University of Turin</sa:organization>
                            <sa:organization>INFN</sa:organization>
                            <sa:city>Turin</sa:city>
                            <sa:postal-code>I-10125</sa:postal-code>
                            <sa:country>Italy</sa:country>
                        </sa:affiliation>
                        <ce:source-text id="srct0390">University of Turin and INFN, (C)INFN,
                            I-10125, Turin, Italy</ce:source-text>
  </ce:affiliation>

and

<ce:affiliation id="aff0780"
                        affiliation-id="S0370269323005798-47d5dbba09b0bd9431eed98216197c7a">
                        <ce:label>bx</ce:label>
                        <ce:textfn>University of Turin and INFN, I-10125, Turin, Italy</ce:textfn>
                        <sa:affiliation>
                            <sa:organization>University of Turin</sa:organization>
                            <sa:organization>INFN</sa:organization>
                            <sa:city>Turin</sa:city>
                            <sa:postal-code>I-10125</sa:postal-code>
                            <sa:country>Italy</sa:country>
                        </sa:affiliation>
                        <ce:source-text id="srct0380">University of Turin and INFN, (A)University of
                            Turin, I-10125, Turin, Italy</ce:source-text>
                    </ce:affiliation>

and then we have an author:

<ce:author id="au0190"
                        author-id="S0370269323005798-b3038b43e63d20193d6435921f446ab8">
                        <ce:given-name>E.</ce:given-name>
                        <ce:surname>Bianco</ce:surname>
                        <ce:cross-ref refid="aff0780" id="crf0250">
                            <ce:sup>bx</ce:sup>
                        </ce:cross-ref>
                        <ce:cross-ref refid="aff0760" id="crf0260">
                            <ce:sup>bz</ce:sup>
                        </ce:cross-ref>
        </ce:author>

It breaks our validation.
Parser source code:
https://github.com/SCOAP3/hepcrawl/blob/master/hepcrawl/extractors/s3_elsevier_parser.py#L181-L182