Analytic Sample Preparation MethodsWebcasts as TopicSpecimen HandlingChemistry Techniques, AnalyticalSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationSensitivity and SpecificityReproducibility of ResultsPolymerase Chain ReactionUnited StatesFood, PreservedCookingBisacodylHistocytological Preparation TechniquesLongitudinal StudiesDrug CompoundingCohort StudiesMicrowavesParticle SizeReference StandardsTandem Mass SpectrometryCross-Sectional StudiesMass Spectrometry