How can I compute voltage gain and power gain of RF power amplifier?

Hi,
I am reading about RF power amplifier, however, I don't see any papers that mentions about voltage gain. Most of them state clearly about output power(dBm) and Power-added efficiency, PAE (%).
Can you tell me how can I compute voltage gain and power gain of RF power amplifier from specifications?

Dear Osawa Odessa: In an earlier reply others and myself tried to explain that all RF amplifiers amplify RF power, and you can measure the voltage across a typical source/load impedance like 50 Ohms. If you need to load your amplifier otherwise to get a higher or lower voltage, you can use RF transformers.

I can see many your questions on the forum. Maybe it is time to read some basics you apparently miss all the time.