“…The total hours of TBF training ranged between 2 and 23.5 hours held over a 3-to 20-week period. One study (Keefe et al, 1980) adopted a group-approach to TBF training while others (Freedman & Ianni, 1983, 1988Jacobson et al, 1979;Guglielmi et al, 1982;Middaugh et al, 2001;RTS Investigators, 2000;Surwit et al, 1978;Thompson et al, 1999) used an individual approach.…”