function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bazzi, Gaia & Galimberti, Andrea & Foglini, Claudio', 1],
    ['Chainthong, Damrong & Boonsoong, Boonsatien', 2],
    ['Cowley, J.', 1],
    ['Dijkstra, Klaas-Douwe B. & Kipping, Jens & Mézière, Nicolas', 1],
    ['Dow, Rory A.', 1],
    ['Ferreira, Sónia & Velo-Antón, Guillermo & Brochard, Christophe', 2],
    ['Ghahari, H. & Thipaksorn, A. & Naderian, H. & Sakenin, H. & A. A', 2],
    ['K. J. Morton', 5],
    ['Legrand, Jean', 3],
    ['Lieftinck, M. A.', 3],
    ['Martin, R.', 6],
    ['Schneider, Thomas & Ikemeyer, Dietmar & Müller, Ole', 1],
    ['Selys-Longchamps, Edm. de', 1],
    ['Syoziro Asahina', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);