V.H, in fact, I'd like to have that information, because it may can be good for each of us (I think).
Most of members here are above 40 years old, so they have "strong experience" in their life and have surely gone more than 2 times in China (and maybe live there by now, too)
Whatever the birthdate is hidden or not, just the Birth's year could be said.
Thanks again for your reply anyway