Article History
Received: 1 May 2018
Revised: 2 October 2018
Accepted: 16 October 2018
First Online: 16 November 2018
Compliance with ethical standards
: The usage and analysis of human milk samples described in this study were performed in accordance with ethical standards and guidelines as laid down in the Declaration of Helsinki. Ethical approval and written consents of donors were given as stated in the publications by Thurl et al. [CitationRef removed, CitationRef removed, CitationRef removed]. The same samples were already subjected to HMOs analysis in these prior studies. They were now used for optimization of a new LC-MS method but for the same purpose of usage (HMO analysis) as stated in the former publications by Thurl et al. [CitationRef removed, CitationRef removed] for which ethical approval was received.
: Marko Mank and Bernd Stahl are employees of Nutricia Research B.V. Philipp Welsch was enrolled as a PhD student at the Technical University of Dresden during this study and performed the practical part of his PhD thesis at Danone Nutricia Research in Utrecht. Albert J.R. Heck is a professor at Utrecht University. The present research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors. None of the authors have further conflicts of interest with regard to the content of this manuscript.