PTH and cyclic hematopoiesis: Patients with PTH-CH were at higher risk of being intractable to acute (OR: 12.34; 95% CI: 2.51–64.73) and preventive treatments (OR: 16.98; 95% CI: 6.88–45.52) and associated chronic migraine (OR: 10.35; 95% CI: 3.96–28.82) (42).