https://www.cochrane.org/fr/CD014803/CENTRALED_la-supplementation-en-acides-gras-polyinsatures-omega-3-est-elle-plus-efficace-quun-placebo-pour 2024 United Kingdom review of literature french abstract depression placebos child polyunsaturated fatty acids child, nos fatty acids, Omega-3 fatty acid, nos adolescence depression, nos depressive disorder adolescent