TY  - JOUR
AU  - Simmons, ED
AU  - Graham, HK
AU  - Szalai, JP
DO  - doi:10.1302/0301-620X.72B2.2312555
UR  - https://doi.org/10.1302/0301-620X.72B2.2312555
TI  - Interobserver variability in grading Perthes' disease
T2  - The Journal of Bone & Joint Surgery British Volume
VL  - 72-B
IS  - 2
PY  - 1990
SP  - 202
EP  - 204
ER  -