medical required after Visa extension for a national from a designated country

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Hi all, I've been reading CIC Manuals and I've found about the so called "6 months rule" whereas anybody who's coming from a designated country staying for a period of time exceeding 6 months should get a medical examination.

So yeah, I'm waiting for my extension to my TRV to come my way and I'm coming from a designated country so I'm pretty positive this applies to me, but wanted to double check with someone whom might have have first hand experience. Also, this medical is to be done where and how much it costs? (I assume they have sort of a list of docs and that you will have to pay whatever they usually charge for whatever CIC asks to get done, but yet again I'm not sure)

Thanks!