Scientific disciplines which study traditional medicine include herbalism, ethnomedicine, ethnobotany, and medical anthropology. He has received training in acupuncture, autogenic training, herbalism, homoeopathy, massage therapy and spinal manipulation. Traditional African medicine is a holistic discipline involving indigenous herbalism and African spirituality. Liquorice extracts have been used in herbalism and traditional medicine. Botany originated as herbalism, the study and use of plants for their medicinal properties. Early pharmacology focused on herbalism and natural substances, mainly plant extracts. Prehistoric medicine incorporated plants (herbalism), animal parts, and minerals. These can be gathering professions, such as mining, herbalism or animal skinning. In modern herbalism, comfrey is most commonly used topically. Moneywort is used in herbalism for healing wounds. Common St John's wort has long been used in herbalism and folk medicine. He is also skilled in herbalism and healing. The species epithet ""officinalis"" denotes an organism associated with herbalism or medicine. The two "fathers" of herbalism, Gerard and Culpeper, also recommended the herb. Kru Khmers specialise in several categories, such as bone setting, herbalism or divining.