Characteristics of post hoc subgroup analyses of oncology clinical trials: a systematic review. - Alrawabdeh J; Alzu'bi M; Alzyoud M; Odeh N; Hamadneh Y; Mian H; Mohyuddin GR; Kelkar AH; Goodman AM; Chakraborty R; Russler-Germain DA; Mehra N; et al. (JNCI cancer spectrum, 2023)