If not for personal savings, pensions, or state welfare, most senior citizens would be left entirely dependent upon their very small family or neighbors for assistance. If for any reason, the single child is unable to care for their older adult relatives, the oldest generations would face a lack of resources and necessities. In response to such an issue, by 2007, all provinces in the nation except Henan had adopted a new policy allowing couples to have two children if both parents were only children themselves; Henan followed in 2011. Unregistered children Heihaizi () or "black child" is a term denoting children born outside the one-child policy, or generally children who are not registered in the Chinese national household registration system. Being excluded from the family register means they do not possess a Hukou, which is "an identifying document, similar in some ways to the American social security card". In this respect they do not legally exist and as a result cannot access most public services, such as education and health care, and do not receive protection under the law. Potential social problems Some parents may over-indulge their only child. The media referred to the indulged children in one-child families as "little emperors". Since the 1990s, some people have worried that this will result in a higher tendency toward poor social communication and cooperation skills among the new generation, as they have no siblings at home. This is coupled with a lack of uncles and aunts for the next generation. No social studies have investigated the ratio of these so-called "over-indulged" children and to what extent they are indulged. With the first generation of children born under the policy (which initially became a requirement for most couples with first children born starting in 1979 and extending into the 1980s) reaching adulthood, such worries were reduced. Toni Falbo, a professor of educational psychology and sociology at the University of Texas at Austin came to the conclusion that no measurable differences exist in terms of sociability and characterization between singleton children and multi-sibling children except that single children scored higher on intelligence and achievement – due to a lack of “dilution of resources”. However a later Australian study by Lisa Cameron et al showed that there were developmental differences that could affect the children's economic and social outcomes. Some 30 delegates called on the government in the Chinese People's Political Consultative Conference