![Low serum 25-hydroxyvitamin D is associated with higher risk of frequent headache in middle-aged and older men]()
Low serum 25-hydroxyvitamin D is associated with higher risk of frequent headache in middle-aged and older menVirtanen, Jyrki K.; Giniatullin, Rashid; Mäntyselkä, Pekka; Voutilainen, Sari; Nurmi, Tarja; Mursu, Jaakko; Kauhanen, Jussi; Tuomainen, Tomi-Pekka · Scientific Reports · 2017