Occupational training: a new scientific approach.
D004526:Efficiency; D005221:Fatigue / Q000517:prevention & control; D006801:Humans; D008297:Male; D009132:Muscles / Q000502:physiology; D009787:Occupational Medicine; D011044:Poland; D012767:Ships; D014829:Vocational Education / Q000639:trends*; D014896:Welding