Letters destined for Canada and Mexico - for the (1) ounce first class letter cost $1.15 with the global forever stamp - applying to all international destinations. To be sendable by the USPS: a letter must have dimensions of no less than 3-1/2 inches tall with a maximum of 6 1/8.
Q: How often do doctors give cortisone injections to a patient? A: We try to limit the injection to one every three months for any single joint, but also we like to limit it to a total of six injections a year for the whole body. We know that the cortisone can sometimes weaken or suppress the immune system and, in diabetics, it raises blood sugar.
1 You need to return for another shot every 11 to 12 weeks and no later than 13 weeks.  The shot slowly wears off over time, so you can't count on being protected against pregnancy longer than 12 weeks after the last shot.