Signs and symptoms. The majority of HPV infections do not cause symptoms or disease and resolve spontaneously. However, persistent infection with specific types of HPV (most frequently types 16 and 18) may lead to precancerous lesions.
1. Tokyo, Japan: Tokyo tops the list and remains the world's largest city with 38 million dwellers. Though the UN has predicted a decline in the city's population, it will still remain the world's most populous city in 2030 with 37 million inhabitants. 2. Delhi, India: With 25 million, the Indian capital is the second-most populated city in the world.
UN World Population Day 2015: These are the 10 most densely populated cities on the planet. There are now more than seven billion people on the planet, a figure that continues to grow every year. In 1950, the population was just 2.5 billion, which means a whopping growth rate of 180%.