One strength is in the value of the applications of the biological approach (Bio A). Therapies such as chemotherapy, which alter the level of neurotransmitters to change behaviour, now enable many people to live in the community rather than in hospital. For example, Viguera (2000) found a success rate of 60% for bipolar patients taking Lithium. This suggests the Bio A is strong as it has improved the quality of peoples lives.
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