Are you regularly using cocaine, crack-cocaine, or amphetamines?

Do you have a brother or sister who doesn't take drugs or drink alcohol heavily?

Are you both aged 18 - 55 years?

Are you both able to spend about 5½ hours in a research study?

Researchers at the University of Cambridge are currently seeking stimulant users and their non-drug using brother/sister to participate in a research study investigating the causes and effects of chronic stimulant use.

Participants will be asked to undergo a brain scan, fill out some questionnaires and perform some computerised tests. A blood sample will also be drawn for genetic analysis.

All information will be kept strictly confidential! Participants will be compensated for their time and inconvenience, and receive a picture of their brain. Travel expenses will be paid additionally.

For more information please contact Dr Karen Ersche or a member of her research team by phone (01223-336587 or 01223-760665) or e-mail: ke220@cam.ac.uk

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