This is the result of query:

PREFIX dcterms: 

PREFIX dc: 

PREFIX skos:  

PREFIX str: } 

PREFIX pao:

vocabular/pao\#> 

PREFIX wp:

SELECT DISTINCT ?concept ?label WHERE {

  SELECT DISTINCT ?concept ?label WHERE {

     SERVICE

   8000/sparql/> {

        wp:WP1531 dcterms:hasVersion ?pwversion . 

        ?pwNode dcterms:isPartOf ?pwversion .

        ?pwNode dcterms:bibliographicCitation ?pmid .}

    ?pmid rdf:type str:Document .

    ?hit str:subString ?pmid .

    ?concept pao:incarnationOf ?hit . 

    ?concept skos:prefLabel ?label .}} 

 OPTIONAL{{ 

   SELECT DISTINCT ?scaiLinkout WHERE {

      SERVICE

   8000/sparql/> { 

          wp:WP1531 dcterms:hasVersion ?pwversion .

          ?pwNode dcterms:isPartOf ?pwversion . 

          ?pwNode dc:identifier ?wpLinkout .}

    ?wpLinkout skos:exactMatch ?scaiLinkout .}} 

  ?conceptTmp skos:exactMatch ?scaiLinkout .

  FILTER (?concept = ?conceptTmp) .}

 FILTER (!BOUND(?conceptTmp)) .}

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