I've a cousin who was a patient of Dr. Mattu and she thinks very highly of him. She delivered her first son at a relatively late age, so I guess Dr. Mattu must have done a pretty good job. My sister went to Dr. lee at MCMC after trying to conceive naturally for close to 4 years but to not to avail. After a few sessions with him, she got pregnant and gave birth to a son. Both doctors are pretty well known in Miri, so it's up to you to choose.