39682478 clusters
Max cluster size: 20

Cluster Size Distribution
1	8217042
2	21520504
3	9940466
4	3340
5	675
6	289
7	94
8	35
9	17
10	8
11	5
12	2
20	1

Cluster Type Distribution
frozenset({('DOI', 5), ('PMID', 1), ('PMC', 2)})	1
frozenset({('PMC', 10), ('DOI', 1), ('PMID', 1)})	1
frozenset({('PMC', 9), ('PMID', 1), ('DOI', 10)})	1
frozenset({('DOI', 6), ('PMC', 5), ('PMID', 1)})	1
frozenset({('DOI', 1), ('PMID', 1), ('PMC', 8)})	1
frozenset({('DOI', 1), ('PMID', 1), ('PMC', 6)})	1
frozenset({('DOI', 6), ('PMID', 1), ('PMC', 3)})	1
frozenset({('PMC', 4), ('PMID', 1), ('DOI', 6)})	2
frozenset({('DOI', 2), ('PMID', 1), ('PMC', 3)})	2
frozenset({('DOI', 4), ('PMID', 1), ('PMC', 1)})	3
frozenset({('DOI', 5), ('PMC', 5), ('PMID', 1)})	3
frozenset({('PMC', 4), ('DOI', 1), ('PMID', 1)})	3
frozenset({('PMID', 1), ('PMC', 2)})	4
frozenset({('DOI', 5), ('PMC', 4), ('PMID', 1)})	6
frozenset({('DOI', 5), ('PMID', 1), ('PMC', 3)})	8
frozenset({('DOI', 1), ('PMID', 1), ('PMC', 3)})	9
frozenset({('PMC', 4), ('PMID', 1), ('DOI', 4)})	9
frozenset({('DOI', 4), ('PMID', 1), ('PMC', 2)})	15
frozenset({('PMID', 1), ('DOI', 4), ('PMC', 3)})	33
frozenset({('PMID', 1), ('DOI', 3), ('PMC', 3)})	79
frozenset({('PMID', 1), ('DOI', 3), ('PMC', 1)})	117
frozenset({('PMID', 1), ('DOI', 3), ('PMC', 2)})	281
frozenset({('DOI', 1), ('PMID', 1), ('PMC', 2)})	342
frozenset({('DOI', 2), ('PMID', 1), ('PMC', 2)})	549
frozenset({('DOI', 2), ('PMID', 1)})	628
frozenset({('DOI', 2), ('PMID', 1), ('PMC', 1)})	2998
frozenset({('PMID', 1), ('PMC', 1)})	712774
frozenset({('PMID', 1)})	8217042
frozenset({('DOI', 1), ('PMID', 1), ('PMC', 1)})	9939834
frozenset({('DOI', 1), ('PMID', 1)})	20807730