40819774 clusters
Max cluster size: 7

Cluster Size Distribution
1	8222765
2	22044446
3	10552112
4	423
5	22
6	4
7	2

Cluster Type Distribution
frozenset({('DOI', 1), ('PMC', 3), ('PMID', 1)})	1
frozenset({('DOI', 3), ('PMID', 1)})	1
frozenset({('DOI', 3), ('PMC', 3), ('PMID', 1)})	2
frozenset({('PMC', 2), ('DOI', 3), ('PMID', 1)})	4
frozenset({('PMC', 2), ('PMID', 1)})	8
frozenset({('PMC', 1), ('DOI', 3), ('PMID', 1)})	10
frozenset({('DOI', 2), ('PMC', 2), ('PMID', 1)})	11
frozenset({('DOI', 1), ('PMC', 2), ('PMID', 1)})	61
frozenset({('PMC', 1), ('DOI', 2), ('PMID', 1)})	361
frozenset({('DOI', 2), ('PMID', 1)})	1758
frozenset({('PMC', 1), ('PMID', 1)})	714976
frozenset({('PMID', 1)})	8222765
frozenset({('DOI', 1), ('PMC', 1), ('PMID', 1)})	10550346
frozenset({('DOI', 1), ('PMID', 1)})	21329470