TY  - GEN
AU  - Kyvik,K O
TI  - Twin methodology is not always easily understood
SN  - 0959-8138
PY  - 1996///1009
KW  - Humans
KW  - Inflammatory Bowel Diseases
KW  - etiology
KW  - Twin Studies as Topic
N1  - Publication Type: Comment; Letter
UR  - https://doi.org/10.1136/bmj.313.7055.491a
ER  -