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机译:Mixed contact methods to improve response to a postal questionnaire
Guys & St Thomas NHS Fdn Trust, Occupat Hlth Serv, London SE1 7EH, England;
Univ Southampton, MRC Lifecourse Epidemiol Unit, Southampton SO16 6YD, Hants, England;
Imperial Coll London, Fac Med, London SW7 2AZ, England;
Nurses; occupational health; responses rates; students; trials;