Hi I am from Chennai, India and I would love to narrate your script for you. I have related samples for you to listen to on my Freelancer portfolio and soundcloud link. I can also mail you the samples if you share a mail id. The price I have quoted is for upto 500 words, but I assume you will have a lot more work and we can work out a rate. I can also proofread the script. Having a family of doctors, I am familiar with a lot of medical jargon :-)
I have my own home studio and have been doing voiceovers for more than 5 years now. I speak English with a neutral accent which is easily understood.