instruction:
In medical studies, the efficacy of medical treatments (called interventions) is evaluated within a group of study participants. You will be given a sentence of a study report in which your task is to list the phrases that describe the intervention(s) of the study. You should list the phrase in the same order that they appear in the text, separated by commas. If no information about the interventions is mentioned, just answer with "not found". Interventions are: a specific drug, surgery, talking therapy, a lifestyle modification, control or placebo treatment. Do not include details, dosages, frequency and duration, intervention mentions that are not in an informative span of text.
question:
This study aimed to investigate the course of depression for patients with recently diagnosed rheumatoid arthritis ( RA ) and to investigate predictors of depression .
answer:
not found


question:
Phase III study of two different dosing schedules of erythropoietin in anemic patients with cancer .
answer:
erythropoietin


question:
Quantitative muscle strength testing sum scores declined in both treatment groups , -0.2 % for methotrexate and -3.4 % for placebo ( 95 % confidence interval = -2.5 % to +9.1 % for difference ) .
answer:

methotrexate, placebo


