“…In a prospective study Benirschke and Bourne (1960) Hnat (1967), and Van Leeuwen, Behringer, and Glen (1967), and the largest series of all, utilizing the records of 12 different hospitals, by Froehlich and Fujikura (1966,1973). Similar publications from Europe include those of Thomas (1961, Germany); Jarvinen, Osterlund, and Van Numers (1961, Finland);844 Gomori and Koller (1964, Switzerland); Papadatos and Paschos (1965, Greece); Muller et al (1969, France);Cederqvist (1970, Sweden);and Vlietinck et al (1972, Belgium).…”