occupational exposure
The study of the neurological disease outcome of workers       who have had long-term, well-defined occupational exposure to one or more metals        is also urged, with collaborative work including industrial hygienists,       occupational toxicologists, neurologists, epidemiologists and biostatisticians.
The study of the neurological disease outcome of  @OBJECT$        who have  @PREDICAT$  long-term, well-defined  @SUBJECT$  to one or more metals        is also urged, with collaborative work including industrial hygienists,       occupational toxicologists, neurologists, epidemiologists and biostatisticians.