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. Author manuscript; available in PMC: 2022 Apr 1.
Published in final edited form as: AJR Am J Roentgenol. 2020 Aug 5;215(4):903–912. doi: 10.2214/AJR.19.22573

TABLE 1:

Distribution of Patients and Control Subjects by Participating Institution

Institution No. Case Subjects Control Subjects Total
1 22 14 36
2 24 17 41
3 30 21 51
4 31 23 54
5 45 9 54
Total 152 84 236