Table 2.

Inclusion and exclusion criteria.

Inclusion criteria	research papers, papers in English, studies in humans, tissue or physiological fluids, except follicular fluid *
Exclusion criteria	review papers, papers in other languages, studies in animals, follicular fluid, studies including only unidentified metabolites, studies focusing on fertility *, studies in cell culture **

* Studies in follicular fluid focusing on infertility and reports on metabolomics in reproductive medicine have been reviewed relatively recently by Bracewell-Milnes et al. [62] and Siristatidis et al. [63]. ** These studies were out of the scope of our review.