Corrigendum to 'Synthesis, structure and third-order optical nonlinearities of hyperbranched metal phthalocyanines containing imide units' [Dyes Pigments 154 (2018) 75–81]. (February 2021) - Wang, Tingfeng; Wang, Xin; Zhang, Jiliang; Wang, Chunrui; Shao, Junfeng; Jiang, Zhenhua; Zhang, Yunhe