Marchán, J. C. “Human Chorionic Gonadotropin, a Versatile Hormone and an Essential Tumor Marker in Nonseminomatous Germ Cell Testicular Cancer”. Revista Colombiana De Endocrinología, Diabetes &Amp; Metabolismo, vol. 6, no. 2, June 2019, pp. 107-13, doi:10.53853/encr.6.2.486.