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Sample output from stochastic differential equation model (2). Middle smooth line: theoretical mean pain; upper and lower smooth lines: ±one theoretical standard deviation; middle noisy black line: mean of pain distribution in ensemble of 100 stochastic simulations; upper and lower noisy gray lines: ±one standard deviation in ensemble of 100 stochastic simulations; bottom dashed line: drug 1 dose in bloodstream. Spikes occur when patient takes recommended dosage.
