At the criterion we'll be using for a comparison Valotin how do you measure the success of a hair loss treatment so there are two ways scientists measure how good a hair loss treatment is the first is so-called subjective assessment or global photography this is where you take before and after photos of the patient's entire head you take one photo at the start of the treatment and then one at the end you then have one or more independent blinded dermatologist assess each pair of photos now the dermatologists are independent because they didn't actually participate.
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