query: SELECT DISTINCT ?item ?linkcount WHERE { 
    {?item wdt:P21 wd:Q6581072; wdt:P496 ?orcid; wikibase:sitelinks ?linkcount .}
    FILTER (?linkcount >0)
   { ?item ?property1 wd:Q801 .} UNION { ?item ?property2 [ wdt:P17 wd:Q801 ] }
  }
  LIMIT 20