TY  - GEN
AU  - Hapgood,Janet P
TI  - ECHO: context and limitations
SN  - 1474-547X
PY  - 2020///0213
KW  - Contraception
KW  - Female
KW  - HIV Infections
KW  - Humans
KW  - Incidence
KW  - Intrauterine Devices, Copper
KW  - Levonorgestrel
KW  - Medroxyprogesterone Acetate
N1  - Publication Type: Letter; Comment
UR  - https://doi.org/10.1016/S0140-6736(19)33154-X
ER  -