Reply to Elmendorf and Ettinger: Photoperiod plays a dominant and irreplaceable role in triggering secondary growth resumption - Huang, Jian-Guo; Campelo, Filipe; Ma, Qianqian; Zhang, Yaling; Bergeron, Yves; Deslauriers, Annie; Fonti, Patrick; Liang, Eryuan; Mäkinen, Harri; Oberhuber, Walter; Rathgeber, Cyrille B. K.; Tognetti, Roberto; et al. (Proceedings of the National Academy of Sciences, 2020)