38506921 clusters
Max cluster size: 20

Cluster Size Distribution
1	8211267
2	21041517
3	9251061
4	1967
5	660
6	287
7	95
8	35
9	16
10	8
11	5
12	2
20	1

Cluster Type Distribution
frozenset({('PMC', 5), ('DOI', 6), ('PMID', 1)})	1
frozenset({('DOI', 5), ('PMC', 2), ('PMID', 1)})	1
frozenset({('DOI', 1), ('PMID', 1), ('PMC', 10)})	1
frozenset({('DOI', 2), ('PMID', 1), ('PMC', 3)})	1
frozenset({('PMC', 6), ('DOI', 1), ('PMID', 1)})	1
frozenset({('DOI', 6), ('PMID', 1), ('PMC', 3)})	1
frozenset({('PMID', 1), ('PMC', 9), ('DOI', 10)})	1
frozenset({('DOI', 1), ('PMC', 8), ('PMID', 1)})	1
frozenset({('DOI', 6), ('PMID', 1), ('PMC', 4)})	2
frozenset({('PMC', 1), ('PMID', 1), ('DOI', 4)})	2
frozenset({('PMC', 2), ('PMID', 1)})	2
frozenset({('PMC', 5), ('DOI', 5), ('PMID', 1)})	3
frozenset({('DOI', 1), ('PMID', 1), ('PMC', 4)})	3
frozenset({('DOI', 5), ('PMID', 1), ('PMC', 4)})	6
frozenset({('DOI', 5), ('PMID', 1), ('PMC', 3)})	7
frozenset({('DOI', 1), ('PMID', 1), ('PMC', 3)})	8
frozenset({('DOI', 4), ('PMID', 1), ('PMC', 4)})	9
frozenset({('PMC', 2), ('PMID', 1), ('DOI', 4)})	15
frozenset({('PMID', 1), ('PMC', 3), ('DOI', 4)})	33
frozenset({('DOI', 2), ('PMID', 1)})	50
frozenset({('DOI', 1), ('PMC', 2), ('PMID', 1)})	66
frozenset({('PMID', 1), ('PMC', 3), ('DOI', 3)})	80
frozenset({('PMC', 1), ('PMID', 1), ('DOI', 3)})	104
frozenset({('PMC', 2), ('PMID', 1), ('DOI', 3)})	281
frozenset({('DOI', 2), ('PMC', 2), ('PMID', 1)})	548
frozenset({('PMC', 1), ('PMID', 1), ('DOI', 2)})	1901
frozenset({('PMC', 1), ('PMID', 1)})	710309
frozenset({('PMID', 1)})	8211267
frozenset({('PMC', 1), ('DOI', 1), ('PMID', 1)})	9251009
frozenset({('DOI', 1), ('PMID', 1)})	20331208