People with benign hyperpigmentation (the darkening or increase in the natural color of the skin), are willing to pay (WTP) nearly 14 percent of their monthly income and approximately 90 minutes a day to cure their condition.
People with benign hyperpigmentation (the darkening or increase in the natural color of the skin), are willing to pay (WTP) nearly 14 percent of their monthly income and approximately 90 minutes a day to cure their condition.