“…The use of anticoagulants and antiplatelet drugs over the (Atkin et al, 1964;Brooks et al, 1970;Clarke & Cliffton, 1960;Hass et al, 1966;Herndon et al, 1960;Larcan et al, 1977;Meyer et al, 1961;Sussman & Fitch, 1958). A further 93 patients entered into studies which were partly controlled but which could be criticised for a number of reasons Hanaway et al, 1976;Labauge et al, 1980;Malinovsky & Kovlov, 1979;Meyer et al, 1964).…”