Subjects: *EXERCISE & psychology; *MULTIPLE sclerosis; *RESEARCHUNITED States; CANADA
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Subjects: *MOTIVATION (Psychology); *SCHOOL environment; *EDUCATIONCANADA
Subjects: *CAREGIVERS; *INTERNET searching; *MOTIVATION (Psychology)UNITED States; CANADA
Subjects: *ACADEMIC achievement; *HIGH schools; *LONGITUDINAL methodAUSTRALIA; CANADA; UNITED States