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Völkerling A, Struck HG, Kunert KS, Schmidt-Pokrzywniak A, Fiorentzis M, Viestenz A, Heichel J.Völkerling A, et al. Among authors: heichel j.Klin Monbl Augenheilkd. 2018 Jan;235(1):24-30. doi: 10.1055/s-0043-123073. Epub 2018 Jan 26.Klin Monbl Augenheilkd. 2018.PMID: 29373867German.