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 and meta‐analysis. - Blok, Joost M.; Pluim, Ilse; Daugaard, Gedske; Wagner, Thomas; Jóźwiak, Katarzyna; Wilthagen, Erica A.; Looijenga, Leendert H.J.; Meijer, Richard P.; Bosch, J.L.H. Ruud; Horenblas, Simon (BJU International, 2020)