Swiss Kidney Stone Cohort (SKSC)

For SKSC Patients Group: Inclusion Criteria: Only patients that meet all of the following inclusion criteria can be included in this study: * Signed Declaration of informed consent * Male or female * Recurrent kidney stone episodes (more than 1) or an individual kidney stone episode with one or several of the following risk factors: * The first manifestation at the a minimum age of 25 * Positive family history * Non-calcium oxalate stones * Gastrointestinal disorders (e.g. gastric bypass surgery, inflammatory bowel disease, malabsorption etc.) * Osteoporosis * Nephrocalcinosis * Single kidneyness * Currently pregnant * Gout * Metabolic syndrome ( Diabetes Mellitus type I and II ) * Residual calculi (at least 3 months after the therapy) * Bilateral or multiple stones * Chronic urinary tract infection * Chronic renal failure (eGFR lower than 60 ml/min.) * Kidney transplant Exclusion Criteria: Patients with at least one of the following exclusion criteria may not take part in this study. * Not signed Informed Consent form * Age below 18 years old For SKSC Control Group Inclusion criteria: * Signed Declaration of informed consent * Male or female * Kidney-stone free (screening verification by low-dose CT-scan) Exclusion criteria: * Not signed Informed Consent form * Age below 18 years old * Pregnancy * History of kidney stones * Low-dose CT-scan positive for kidney stones during screening phase