Cross your arms over your chest like a self-hug. Rest your palms on your chest. If you want, link your thumbs together so your hands form the shape of butterfly wings. Gently tap your chest once with ...
Correspondence to Dr Parco M Siu, The University of Hong Kong, Hong Kong, 999077, Hong Kong; pmsiu{at}hku.hk Data sources Embase, MEDLINE, PsycINFO, Cochrane Library, Web of Science, Scopus and ...