Man with three faces' suffers from rare genetic condition

Neurofibromatosis Type 1 (NF1) is a genetic disorder causing tumors along nervous tissue. Key indicators include skin spots and bumps on the iris. Symptoms usually appear by age 10. NF1 affects 1 in 3000 people globally, totaling 3 million. A 2014 study by Washington University found both sexes have equal chances of developing NF1, though it affects them differently.

How many people are affected by Neurofibromatosis Type 1 worldwide?

How does Neurofibromatosis Type 1 affect males and females differently?