Articles and lists of countries

Hello,

Being a non-native speaker of English whose mother tongue doesn't employ any articles at all I'm sometimes unsure as to whether I'm using the articles in a particular phrase correctly or not.

That's why I'm always grateful for any comments or advice from people who know better.

In a list of countries, such as the one below, is it correct to use the definite article before all country names that normally have it, or can they be omitted without affecting the grammaticality/meaning of the sentence? Many thanks in advance!

"...
[a product name] has been successfully implemented in hundreds of companies of various specializations in the Czech Republic, Slovakia, Hungary, the USA, the UK, China and Germany.
..."

Maybe it's the wording that needs to be changed to make it look and sound a little more natural...?

Of course, I'll be grateful for any corrections of any mistakes you're able to spot! 

Thanks once more!

P.