Figures show the number of patients in Wales waiting longer than 36 weeks for treatment has risen sharply.
7,611 patients waiting for that length of time in April, a rise of more than 2,000 on the previous month, according to Statistics Wales figures.
The Welsh Government has a target for 100% of patients to begin treatment within 36 weeks.
A further 30,988 were waiting between 26 and 36 weeks to start treatment.
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