TY - GEN AU - Mulder,P G TI - The "case-control" study SN - 0021-9681 PY - 1986///0819 KW - Epidemiologic Methods KW - Humans KW - Mathematics KW - Sampling Studies N1 - Publication Type: Comparative Study; Letter UR - https://doi.org/10.1016/0021-9681(86)90205-5 ER -