Lymphovascular invasion and presence of embryonal carcinoma as risk factors for occult metastatic disease in clinical stage I nonseminomatous germ cell tumour: A systematic review... oleh J.M. Blok, I. Pluim, G. Daugaard, T. Wagner, K. Józwiak, E.A. Wilthagen, L.H.J. Looijenga, R.P. Meijer, J.L.H.R. Bosch, S. Horenblas