E. Smith

Studies on copper metabolism. VIII. The correlation between the serum copper level and various serum protein fractions.

G. Cartwright, M. Wintrobe, B. Jager, 1953, The Journal of laboratory and clinical medicine.

Correlation between serum and salivary cortisol levels in depressed and nondepressed children and adolescents.

R. Reichler, E. McCauley, E McCauley, 1985, The American journal of psychiatry.