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問題のWHOの文章使いながらのがわかりやすいから使うけど
選んだ専門家グループは様々な論文を示しながら有害と書いてるように見えるけど

例えばこの部分だと
>Better-controlled case-control studies since then (Crane et al., 2013;
>Solowij & Battisti, 2008; Grant et al., 2003; Schreiner & Dunne, 2012) have
>consistently found deficits in verbal learning, memory and attention in
>regular cannabis users (see section 5.1.2).

根拠はこれでしょ
(Crane et al., 2013; Solowij & Battisti, 2008; Grant et al., 2003; Schreiner & Dunne, 2012)