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Aisha Hutchinson, Philippa Waterhouse, Jane March-McDonald, Sarah Neal, Roger Ingham, Understanding Early Marriage and Transactional Sex In the Context of Armed Conflict: Protection at a Price, International Perspectives on Sexual and Reproductive Health, Vol. 42, No. 1 (March 2016), pp. 45-49
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Hutchinson et al. (2016) studied this question.
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