Hashida S., Kitamura K., Nagatomo Y., Shibata Y., Imamura T., Yamada K., Fujimoto S., Kato J., Morishita K. and Eto T. Development of an ultrasensitive enzyme immunoassay for human proadrenomedullin N-terminal 20 peptide (PAMP) and direct measurement of two molecular forms of PAMP in plasma from healthy subjects and patients with cardiovascular disease. Clin. Biochem.37: 14-21(2004).
Costigan DC, Guyda HJ, Posner BI.: Free insulin-like growth factor I (IGF-I) and IGF-II in human saliva. J Clin Endocrinol Metab.1988 May; 66(5): 1014-8.
Antonelli G, Cappellin E, Gatti R, Chiappin S, Spinella P, De Palo EF. Measurement of free IGF-I saliva levels: perspectives in the detection of GH/IGF axis in athletes. Clin Biochem.2007 May; 40(8): 545-50.
Frystyk J: Utility of free IGF-I measurements. Pituitary.2007; 10(2): 181-7.