Some papers have multiple AuthorCollection and AbstractCollection nodes with nearly identical content. An example Query that yields such a Paper is
MATCH (n:Paper)-[:PAPER_HAS_AUTHORCOLLECTION|:PAPER_HAS_ABSTRACTCOLLECTION]->(x)-[]->(y) WHERE ID(n) = 2385532 RETURN DISTINCT n,x,y
And this is one example of a paper that has two identical abstracts and mentions the authors twice.