Whilst the vast majority of Visa's account ranges describe 16 digit card numbers there are still a few (40 as of 11 Dec. 2013) account ranges dedicated to 13 digit PANs and several (439 as of 11 Dec. 2013) account ranges where the issuer can mix 13 and 16 digit card numbers.
Causes of sinusitis. Sinusitis is caused by too much mucus, or a swelling of the lining of the sinuses and nose, which can block the narrow channels. This can occur during a cold, or may be due to allergy (for example, hayfever) or irritation of the linings of the sinuses (for example, from chlorine in a swimming pool).
It's inflammation or swelling of your sinuses. Normally they're filled with air. When they become blocked and filled with fluid, bacteria can grow there and cause infection. The result: a sinus infection. You may hear your doctor refer to it as sinusitis.