Current urinary mass screening for catecholamine metabolites at 6 months of age may be detecting only a small portion of high-risk neuroblastomas: a chromosome and N-myc amplification study. - Kaneko,Y.; Kanda,N.; Maseki,N.; Nakachi,K.; Takeda,T.; Okabe,I.; Sakurai,M. (J Clin Oncol, 1990)