TY  - GEN
AU  - Sauerland,Stefan
AU  - Neugebauer,Edmund A M
TI  - An experiment of mailing physician surveys on two different issues in joint or separate mail
SN  - 0895-4356
PY  - 2002///1213
KW  - Data Collection
KW  - economics
KW  - Humans
KW  - Physicians
KW  - Postal Service
KW  - Selection Bias
N1  - Publication Type: Clinical Trial; Journal Article; Randomized Controlled Trial
UR  - https://doi.org/10.1016/s0895-4356(02)00459-6
ER  -