References
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- . Cobb, S., Warren, J. E., Merchant, W. R. & Thompson, D. J.: J. Chron. Dis., 5, 636, 1957.
- . Hellgren, L.: An Epidemiological Survey of Skin Diseases, Tattooing and Rheumatic Diseases. Almqvist & Wiksell, Stockholm, 1967.
- . Kellgren, J. H.: Bull. Rheum. Dis., 13, 3, 1962.
- . Kidd, C. W. & Park, A. T.: Ann. Rheum. Dis., 19, 158, 1960.
- . King, S. H. & Cobb, S.: J. Chron. Dis., 7, 466, 1958.
- . Ropes, M. W., Bennett, G. A., Cobb, S., Jacox, R. & Jessar, R. A.: Bull. Rheum. Dis., 9 (no. 4) 1958.
- . Statistisk Årsbok för Sverige, Årg. 52. Central Bureau of Statistics, Stockholm, 1965.
- . Sundelin, F.: Acta Med. Scand., 114, 529, 1943.