function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cho, H. - W. & An, S. L.', 4],
    ['Feng, Chuan & Yang, Xing-Ke & Li, Zhi-Qiang & Liu, Yang', 2],
    ['Lee, Chi-Feng', 8],
    ['Lee, Chi-Feng & Ẽk, Jan Bezd', 4],
    ['Sergeev, M. E.', 2],
    ['Xu, Si-yuan & Nie, Rui-E & Yang, Xing-ke', 15]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=35)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);