Columbia subject headings:
Chronic diseases--Case studies.
Darwin, Charles, 1809-1882.
Naturalists--United States--Biography.
Harvard subject headings:
Case studies
Chronic diseases--Case studies.
Chronic diseases--Cases, clinical reports, statistics.
Darwin, Charles, 1809-1882
Naturalists--Great Britain--Biography
Princeton subject headings:
Chronic diseases--Case studies.
Darwin, Charles, 1809-1882.
Naturalists--Great Britain--Biography.