throughout the Dutch East Indies (present-day Indonesia) was published in 1911 by Mrs. Kloppenburg-Versteegh. One of the first European physicians to study jamu was Jacobus Bontius (Jacob de Bondt), who was a physician in Batavia (present-day Jakarta) in the early seventeenth century. His writings contain information about indigenous medicine of Java. A comprehensive book on indigenous herbal medicine in the Dutch East Indies (present-day Indonesia) was published by Rumphius, who worked in Ambon during early eighteenth century. He published a book called Herbaria Amboinesis (The Ambonese Spice Book). During the nineteenth century, European physicians had a keen interest in jamu, as they often did not know how to treat the diseases they encountered in their patients in the Dutch East Indies (present-day Indonesia). The German physician Carl Waitz published on jamu in 1829. In the 1880s and 1890s, A.G. Vorderman published extensive accounts on jamu as well. Pharmacological research on herbal medicine was undertaken by M. Greshoff and W.G. Boorsma at the pharmacological laboratory at the Bogor Botanical Garden Popularity Indonesian physicians were initially not very interested in jamu. During the second conference of the Indonesian Association of Physicians, held in Solo in March 1940, two presentations on the topic were given. During the Japanese occupation, Indonesia's Jamu Committee was formed in 1944. During the following decades, the popularity of jamu increased, although physicians had rather ambivalent opinions about it. Indonesia—home to highly diversified herbs products—expects domestic sales of herbal and traditional medicine, including food supplements and cosmetics, to expand by 15 percent by 2014 to Rp 15 trillion (US$1.23 billion) compared to 2013, due to its increasingly health-conscious middle-income bracket, according to the Indonesian Herbal and Traditional Medicine Association (Gabungan Pengusaha Jamu/GP Jamu). Jamu contributes Rp 3 trillion (US$73.29 million) to overall sales. Several Indonesian leading figures are known as the endorser of jamu herbal products, including former first lady Tien Soeharto, business figures Mooryati Soedibyo and Jaya Suprana, and President Joko Widodo. Joko admitted that he had consumed the herbal medicine, locally known as temulawak jahe (the mixture of ginger and curcuma) for 17 years which he believed has helped him in his daily activities as well as to repair the liver and digestive functions. Form Jamu is often distributed in the form of powder, pills, capsules, and drinking liquid. Jamu shops, which sell only ingredients or prepare the jamu on spot as required by buyers, as well