A method for forming a set of DFB lasers includes the steps of forming active layers having different peak gain wavelengths, measuring the peak gain wavelengths of the active layers, and forming diffraction gratings having periods based on the measured peak gain wavelengths, the periods allowing the detuning amount of the DFB laser device to fall within a design value. The processor executes an application, a first data-transfer object, and a second data-transfer object, publishes data under the control of the application, loads the published data into the buffer under the control of the first data-transfer object, and retrieves the published data from the buffer under the control of the second data-transfer object. Inlet channels for supplying and distributing starting materials and outlet channels for collecting and discharging products are defined by, in each case, inversely arranged closed and open channel ends. A transaction with a user is then verified by matching the dynamic visual code with a code string entered by the user. In embodiments of the invention, assessment of dopamine transporter levels includes assessing binding of a dopamine transporter ligand to the dopamine transporters using PET or SPECT.