Hello Nicola,
I had purchased 3 vials and been given 6 month free storage, thanks 
Then I bought another vial (just one) recently. I thought 4th vial would be added to previous but it seems to be isolated with 30 days free storage. Unless they get together, there is difference of expire dates between 1st-3rd’s and 4th’s. Is there any way to put them all together for storage ?
Regards,