“…Substrate loading with lecithin or choline has been tried with little improvement (Etienne et al, 1978(Etienne et al, , 1981Summers et al, 1981 ;Thal et al, 1981;Kaye et al, 1982;Pomara et al, 1983;Smith et al, 1984;Samorajski, Vroulis and Smith, 1985;Growdon et al, 1986) despite initial promise (Levy, 1978;Brinkman et al, 1982a,b;Canter, Hallett and Growdon, 1982;Little et al, 1985).…”