In November 2007, Bangkok's Assumption Cathedral became the venue of ecumenical pilgrimage of trust, when Christians from different backgrounds gathered to pray together. Among those present were religious leaders of the Roman Catholic Church, the Evangelical Lutheran Church of Thailand, the Church of Christ in Thailand, the Russian Orthodox Church and also young people from Laos, the Philippines, Hong Kong, Singapore and Malaysia who came specially for the prayer meetings. Similar programs of worship have been held annually at First Church (Chiang Mai) and elsewhere across Thailand. Non-denominational efforts and inter-agency coordination have involved such agencies as the Church's AIDS Ministry, Voice of Peace, Lamp of Thailand, World Vision, Worldwide Faith Missions, Christian Children's Fund, McKean Leprosy Hospital (now McKean Rehabilitation Institute), Klong Thuy Slum Ministries, and the Christian Development Fellowship. Thailand has served as the destination of choice in Asian Christian gatherings and has served as the headquarters of the Christian Conference of Asia since the handover of Hong Kong. There are many sources for estimating the affiliation of Thai people in Christian denominations. The primary sources are from the government population data and from the membership records of the individual denominations. Reliable data on determining religious affiliation are not based on objective standards in all cases. The most objective report that counts individuals is government census data. Less objective standards would seek to include theological criteria in the counting of members such as belief, baptism, confirmation as well as age criteria such as persons over age 12, 15, 18 or adulthood. None of these standards of various denominational data discriminate based on gender, health or ethnicity. Government data are based on the National House Register in which heads of households register the members of the household with the local District Office. At birth, persons declare their religious affiliation in this manner. A national census is taken of this data every 10 years. As of 2000, the latest [national census data] currently available, 486,840 people were registered as affiliates of Christian denominations or under 1% (0.7%) of total population (60 million). Comparisons of this data to determine whether Christians in Thailand are predominantly a certain gender, age or are from urban/rural areas does not show any remarkable variation from the near 1% figure, although the age group of 10-14 shows the highest (1.0%) ratio of Christians to national population. There may be limitations to this approach to verifying religious affiliation, such as inconsistent reporting, the change of religion to Christianity of young people under their parent's house register, reversion of young people to Buddhism and local administrative bias towards Buddhism.