Columbia subject headings:
Chronic pain--France--History--19th century.
Chronic pain--Germany--History--19th century.
Chronic pain--Great Britain--History--19th century.
Medicine--History--19th century.
Harvard subject headings:
Chronic pain--France--History--19th century.
Chronic pain--Germany--History--19th century.
Chronic pain--Great Britain--History--19th century.
Chronic pain--History--France--19th century.
Chronic pain--History--Germany--19th century.
Chronic pain--History--Great Britain--19th century.
Medicine--History--19th century.
Princeton subject headings:
Chronic pain--History.
Medical writing--History.
Pain--History.