PT - JOURNAL ARTICLE AU - Jen Lewis AU - Christopher Burton TI - Understanding the consequences of GP referral thresholds: taking the instrumental approach AID - 10.1136/bmjqs-2022-015557 DP - 2023 Jun 01 TA - BMJ Quality & Safety PG - 309--311 VI - 32 IP - 6 4099 - http://qualitysafety.bmj.com/content/32/6/309.short 4100 - http://qualitysafety.bmj.com/content/32/6/309.full SO - BMJ Qual Saf2023 Jun 01; 32