Signature of an<i>h</i><sub>1</sub>state from<i>J/ψ</i>→<i>ηK</i>*<sup>0</sup><i>K̄</i>*<sup>0</sup>and theoretical description of the<i>Z<sub>c</sub></i>(3900) and<i>Z<sub>c</sub></i>(4020) as<i>DD̄</i>* and<i>D</i>*<i>D̄</i>* molecular states
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