function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['GuK, Xin-yao & LiK, Hai-tao & JinK, Dao-chao & GuoK, Jian-jun', 1],
    ['Guo, Jianjun & Jin, Dao-Chao', 1],
    ['Habeeb, Herbert', 2],
    ['Imamura, Taiji', 2],
    ['Marshall, Ruth', 2],
    ['O\'Neill, Joseph C. & Fisher, J. Ray & Nelson, Whitney A.', 21],
    ['Pesic, Vladimir & Smit, Harry', 2],
    ['Pešić, Vladimir & Chatterjee, Tapas & Bordoloi, Sabitry', 1],
    ['Walter, C.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=33)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);