Something people have been wondering about is partially answered in that paper:
"Six months after the end of the treatment, the volunteers returned for follow-up (Fig. 2). Ninety percent of the volunteers treated with only minoxidil had recurrence of hair loss, and all newly formed hair was lost. For the group that received only microneedle treatment and the group that received the combination treatment, the newly formed hair was maintained very well: 10% of the volunteers lost all the new hair, 70% of the volunteers had a small amountof hair loss, and 20% of the volunteers maintained the increased hair density after treatment."
"Six months after the end of the treatment, the volunteers returned for follow-up (Fig. 2). Ninety percent of the volunteers treated with only minoxidil had recurrence of hair loss, and all newly formed hair was lost. For the group that received only microneedle treatment and the group that received the combination treatment, the newly formed hair was maintained very well: 10% of the volunteers lost all the new hair, 70% of the volunteers had a small amountof hair loss, and 20% of the volunteers maintained the increased hair density after treatment."
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