Historical Aspects.Published in:Acta Paediatrica, 1957, v. 46, n. s114, p. 5, doi. 10.1111/j.1651-2227.1957.tb16182.xPublication type:Article
Present Investigation.Published in:Acta Paediatrica, 1957, v. 46, n. s114, p. 12, doi. 10.1111/j.1651-2227.1957.tb16183.xPublication type:Article