TY  - JOUR 
T1  - Serum 25-hydroxyvitamin D levels in patients with Granulomatosis with Polyangiitis: association with respiratory infection
JO  - Clinics
A1  - Perez, Mariana O.
A1  - Oliveira, Ricardo M.
A1  - Levy-Neto, Mauricio
A1  - Caparbo, Valeria F.
A1  - Pereira, Rosa M.R.
SN  - 1807-5932
UL  - 10.6061/clinics/2017(12)02
VL  - 72 
Y1  - 2017
PB  - Brasil 
ER  -