Medical ECG low power/low distortion DIP Op amp

I have been having trouble choosing an appropriate op amp package that meets the criteria stated in the tittle of this thread. Most of the op amps recommended in the medical applications section of this website are SO packages and too small to use in prototyping breadboard. Any suggestions or advice on choosing a particular model ? The functions required are for the Right leg driver and filtering of the ECG. I already have an instrumentation amplifier

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