“…[13,14] The most widely used techniques to analyze the elemental composition of gallstones are atomic absorption spectroscopy (AAS), energy-dispersive X-ray fluorescence (ED-XRF), inductively coupled plasma (ICP) atomic emission spectroscopy/mass spectrometry (MS), laser-based spectroscopic techniques (laser-induced plasma spectroscopy/ laser-induced breakdown spectroscopy/laser ablation ICP-MS), time-of-flight secondary ion mass spectroscopy, particle-induced X-ray emission, and scanning electron microscopy attached with energy-dispersive X-ray. [15][16][17][18] In addition to the major elements, it is also important to study the presence and effects of trace elements, which participate in various metabolic processes inside human body including stone formation. In recent years, several spectroscopic methods have been employed to investigate gallstones to identify novel, minimal, and noninvasive methods.…”