How to detect P-R interval from ECG signal

How can I detect P-R interval from an ECG signal using MATLAB ? Can anyone give me code or any steps to determine this ?

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Code: no. There is nothing I can find in the File Exchange. You are welcome to search it in case I missed something.

Go through this PubMed search in your university library and find an appropriate method. (Set Display Settings at the top of the page to ‘Abstract’, 200, and ‘Pub Date’.)

I would also do a general Internet search.