TY  - GEN
AU  - Johnston,D
TI  - [Various "pitfalls" in the performance of controlled randomized prospective studies]
SN  - 0009-4722
PY  - 1979///0925
KW  - Humans
KW  - Methods
KW  - Peptic Ulcer
KW  - surgery
KW  - Probability
KW  - Prospective Studies
KW  - Thinking
KW  - Vagotomy
N1  - Publication Type: Journal Article
ER  -