function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aqmal-Naser, Mohamad & Ali, Norsyafira Anis', 1],
    ['Fowler, Henry Weed', 1],
    ['Heok Hee Ng & Heok Hui Tan', 15],
    ['Ikhwanuddin, Mat Esa Mohd & Amal, Mohammad Noor Azmai', 1],
    ['Ng, Casey Keat Chuan & Lim, Teow Yeong & Ahmad, Amirrudin', 3],
    ['Ng, H. H. Tan H. H.', 5],
    ['Ng, Heok Hee', 4],
    ['Ng, Heok Hee & Hadiaty, Renny K.', 1],
    ['Ng, Heok Hee & Tan, Heok Hui', 1],
    ['Sudasinghe, Hiranya & Meegaskumbura, Madhava', 1],
    ['Sulaiman, Zohrah & Hui, Tan Heok & Lim, Kelvin Kok Peng', 2],
    ['Tan, T. H. T. & Ng, Peter K. L.', 1],
    ['Çiçek, Erdoğan & Fricke, Ronald & Eagderi, Soheil', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=39)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);