Eligibility Criteria:
Inclusion Criteria:
* Subjects should provide written informed consent to participate in the study
* Women of child-bearing potential agree to apply a highly effective method of birth control during the entire duration of the trial. Highly effective birth control is defined as those which result in a low failure rate (i.e., less than 1% per year) when used constantly and correctly such as implants, injectables, combined oral contraceptive method, or some intrauterine devices (IUDs), sexual abstinence, or vasectomized partner. Women of non-childbearing potential may be included if surgically sterile (tubal ligation or hysterectomy) or postmenopausal with at least 2 years without spontaneous menses.
* Subjects who are capable to understand the study and the questionnaires, and to comply with the study requirements.
* Healthy volunteers should consider themselves healthy and should not be medically examined
Exclusion Criteria:
* History of major surgery of the gastrointestinal tract (appendectomy, hemorrhoidectomy, or polypectomy greater than 3 months post-surgery are allowed).
* Known underlying organic gastrointestinal disease, including intestinal obstruction, ileus, intestinal perforation, severe inflammatory disorder like ulcerative colitis, Crohn's disease or toxic megacolon
* Diabetes mellitus types 1 and 2
* Concomitant Kidney or Liver disease, Biliary obstruction
* Decreased cardiac -or respiratory function
* Pregnant or breastfeeding women
* Use of antibiotics in the past month
* History of skin allergies or a history of extreme sensitivity to cosmetics or lotions
* Fragile skin vulnerable to skin tears.
* Damaged epigastric skin (open wounds, rash, inflammation)
* Subjects who are unable to remain in a relaxed reclined position for the test duration
* Subject has received an investigational drug or used an investigational medical device within 30 days prior to randomization, or is currently enrolled in an investigational study.
* The use of following drugs 1 month prior to inclusion and during the whole study duration: laxatives, opioids, anti-acids, anticholinergics/antispasmodics, anticonvulsants, antidepressants, diuretics, antihypertensives, antipsychotics, calcium channel blockers, bile acid sequestrants, iron supplements, anticoagulants, HIV protease inhibitors (saquinavir, lopinavir), atorvastatine, negazodone, efavirenz, Sint-janskruid (CYP3A4 inducers)