Give this lady a try and this website; Dr. Kristina G. Hobson, MD
http://www.healthgrades.com/physician/dr-kristina-hobson-2g7cdThere were 17 responses (to her practices) in total, most others received only a few or more.
*Patient satisfaction 4.5 out of 5 stars
*How well provider listens and answers questions 5 out of 5 stars
*Spends appropriate amount of time with patients 5 out of 5 stars
Theres much more on here including phone number Northern Cali address etc.
In all there were 107 CRS Dr's in your area at that site, for some reason she jumped out at me. Give her a call.
Great reviews on her also here:
http://www.yelp.com/biz/kristina-g-hobson-md-los-gatosHome page of the 107 CRS Dr's in the bay area:
http://www.healthgrades.com/provider-search-directory/search?q=colon+rectal+surgeon&prof.type=provider&search.type=provider&loc=San+Francisco%2C+CA&locIsSolrCity=false#pagenumber=2&sortby=bestmatch&isdirectory=&q=colon+rectal+surgeon&loc=San+Francisco%2C+CA&prem=&f.distance.display=middle&f.distance_ftop=100&f.distance=100Click on patient satisfcation for low down
I plugged Dr. OOmmen in google and it took me directly to the above site he got 15 responses in total which is also good. And compare his specs with the other Dr....
Surprising reviews on Dr. Oomen same site as lady Dr. above
http://www.yelp.com/biz/samuel-oomen-md-walnut-creek-2*Patient Satisfaction 4.5 out of 5 stars
*How well provider listens and answers questions: 4.5 out of 5 stars
*Spends appropriate amount of time with patients: 5 out of 5 stars
GL hth
P.S. I know Luka, again you have probably done your homework, but theres always a possibility you may have overlooked this Doc. Good luck to you.