Volunteers will need to have an outpatient visit and two inpatient visits of two nights each at the General Clinical Research Center at Saint Marys Hospital. The overnights can be done during the week or on weekends. During the inpatient visits, blood and urine samples will be collected and calcium or sugar water will be given intravenously. The inpatient visits will be approximately one week apart. One day prior to the inpatient visits, all meals will be eaten at the General Clinical Research Center.
Remuneration is offered.