Addressing an envelope

If both Mr.and MRs. are doctors how do you adress the envelope?

I have this thread saved- not sure if it will have that though addressing invites

If I had to guess I would say it would be

if they have the same last name:
The Doctors Mandal

if different last names

Doctor Wife & Doctor Husband

uh oh, was i supposed to write out 'Doctor' rather than 'dr'?

whoopps! too late now invites are sent

This website says
doctor A and Doctor A -

http://www.calligraphy-experts.com/envelope_addressing_etiquette.aspx

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Posted by KK Holiday

uh oh, was i supposed to write out 'Doctor' rather than 'dr'?

whoopps! too late now invites are sent

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I dont think that matters