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Regarding guidelines and protocols, the scientific community generally accepts the World Health Organization (WHO) protocols

This could lead to a concentration gradient within the vial, meaning some draws might have a slightly higher or lower concentration of the preservative

Manage stress: Incorporate relaxation techniques such as meditation, deep breathing, or gentle exercise to reduce gut-related stress

Fortunately, computerized control systems on a circuit board (e.g., Arduino, Teensy, LaunchPad, BBC Micro:bit and many others) are now available, inexpensive and easy to operate (Greenspan et al., 2016)

doi: 10.1016/j.addr.2008.04.015