Article: To be professional, you start with your company's information at the top of the page. If you don't have a company name, just start with your name at the top. It can be centered or all the way over to the left. Treat the invoice like a business letter. That is, you can have a professional header at the top, centered in the middle. On the other hand, a simple statement of your business name is also effective. Put your address, phone number, email, and any other relevant contact information. Make sure to use your business information, not your personal information.  A fax number may also be relevant. If you accept payment services like PayPal, be sure to use the email you have set up with that account. Just like with a business letter, you now move on to the person you're billing. If it's a business, use the business address and contact information that the company gave you.  If it's a person, use what information you have, but preferably their business contact information. If you don't have enough information, you may need to contact the person or business with the information you do have to find out more. If it's a large company, you may want to call anyway to ask exactly who to address the invoice to. Create a unique identification number for each of your repeat customers. Then, make sure that this number is included on every invoice that you write for this customer. This will allow you to group invoices by customer and, if necessary, assess their payment history or document a consistent failure to pay. If you're sending out invoices on a regular basis, it's important that each one has a unique number so it's easy to reference and identify. How you choose a number is up to you, but remember that you must have a new one for each invoice.  One simple way is to just start out at one and work your way up. To keep the length of the number uniform, you could start with "0000001."  Another method is to assign a customer number and then use the date. For instance, if the customer number is 305 and the date is February 2, 2016, you could use 305-02022016 as your number. Just make sure you're clear on what the "date" should be. Is it when the service was rendered or when you created the invoice? Near the top, put the label "invoice date." Next to it, add the date that you are creating the invoice. This helps both you and the customer keep track of the time.  You can also include the billing period. The billing period is based on how you set up your invoicing. For instance, if you invoice once a month, that means your billing period is from the beginning of the month to the end of the month, and the services you performed during that period will be included on the invoice.
Question: What is a summary of what this article is about?
Put your company's name at the top. Add your contact information. Add the addressee's name or business. Include a customer account number. List a unique invoice number near the top. Include the invoice date.

Problem: Article: Iodine deficiency used to be the major cause of goiters worldwide, but is now less common in parts of the world where iodine is added to packaged table salt (iodized salt). However, if you don’t regularly consume iodized salt, your doctor may ask you to increase your intake to about ½ teaspoon (4.8 g) of salt per day (enough to get 150 micrograms of iodine).  If you are on a very low-sodium diet, primarily use sea salt, or buy non-iodized table salt, it’s possible you might have an iodine deficiency. In some cases—for instance, if your body has difficulty processing iodine so it reaches your thyroid gland—your doctor may prescribe a daily iodine supplement. If you’re on a low-sodium diet for medical reasons and aren’t looking to increase your salt intake, you can ingest more iodine in other ways as well. Seawater is a natural source of iodine, so seaweed (kelp) and shellfish (shrimp in particular) are good food sources of iodine.  Sushi is a great source of seaweed/kelp. Seaweed and seaweed-derived iodine are also available in supplement form. You might, for instance, try eating shellfish 2-3 times per week and taking a daily kelp supplement for a few weeks, then go back to your doctor to check for improvement. If you live near the ocean, locally grown produce picks up iodine from the soil, and local dairy products will also contain higher amounts of iodine. In this case, “eating local” may benefit your thyroid and help reduce a goiter. If you live far from the sea, try eating more fruits and vegetables that are naturally higher in iodine, such as citrus, strawberries, lettuce, onions, and garlic. It may seem contradictory, but some goiters are caused by your thyroid getting too much iodine instead of too little. In this case, you need to cut back on iodized salt, shellfish, seaweed, and other higher-iodine foods. This is why it’s important to get a medical diagnosis instead of trying to treat a goiter on your own. Otherwise, you might increase your iodine intake and actually make the problem worse.
Summary: Use iodized salt if you have an iodine deficiency. Increase low iodine by consuming seaweed and shellfish. Eat iodine-rich foods grown or raised in coastal areas, if possible. Reduce your iodine intake if advised by your doctor.

The virus that causes warts can be passed from person to person if the warts are touched or picked at. Leave the warts on your hands alone and avoid picking or scratching at the warts. You should also never share the emery board or pumice stone that you used to file down your warts with someone else. Only use the emery board or pumice stone on your warts and nowhere else on your body to avoid spreading the virus. If possible, avoid biting your fingernails. Broken skin, such as skin that has been bitten or chewed, is more susceptible to the development of warts.  You should also avoid brushing, clipping or shaving any areas that have warts as this can irritate the warts and spread the virus. Keep your nails and hands clean. Always wash your hands well after touching your warts or any shared surfaces, such as exercise equipment at the gym or the handle on a bus. Reduce your risk of developing warts or passing them on to others by always wearing plastic flip flops in the change rooms and the public areas of public pools or showers.. If you have warts and are planning to go swimming in a public pool, put a waterproof plaster over the warts to prevent the spread of infection.
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One-sentence summary --
Do not pick at the warts and avoid direct contact with other people’s warts. Practice good hand and nail hygiene. Wear flip flops around public pools and in public showers.