Table 1.

Variable combination of English keywords used for paper search.

Children OR adolescents

AND *abdominal pain OR irritable bowel syndrome OR dyspepsia OR

AND psychophysiology OR oxytocin OR cortisol OR blood pressure OR endocrine* OR reactivity OR heart* OR *nervous system OR Hypothalamic-pituitary-adrenal axis/HPA OR electrodermal activity/EDA OR skin conductance OR evoked potentials OR electroencephalography, EEG OR startle

*is meant as symbol for a wildcard.