Received: 30 June 2019
Revised: 21 September 2019
Accepted: 3 October 2019
First Online: 4 November 2019
Compliance with ethical standards
: Christoph J. Bolten and Jeroen Muller are employed by Nestlé Research, Switzerland, which is part of Société des Produits Nestlé SA, a wholly owned subsidiary of Nestlé SA. Muzi Tangyu and Christoph Wittmann declare that they have no conflict of interest.
: This mini-review does not contain any studies with human participants or animals performed by any of the authors