function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chan, Jeffery C. F. & Tsang, Alphonse H. F. & Yau, Sze-man', 2],
    ['Chevey, P.', 1],
    ['Eagderi, Soheil & Mouludi-Saleh, Atta & Esmaeili, Hamid Reza', 1],
    ['Mori, T.', 1],
    ['Nichols, J. T.', 2],
    ['Nichols, J. T. & Pope, C. H.', 1],
    ['Nikolskii, A. M.', 1],
    ['Peters, Wilhelm Carl Hartwig', 1],
    ['Sayyadzadeh, Golnaz & Esmaeili, Hamid Reza', 1],
    ['Tang, D. S.', 1],
    ['Tchang, T. - L.', 1],
    ['Wang, K. - F.', 1],
    ['Warpachowski, N. A.', 1],
    ['Warpachowski, N. A. & Herzenstein, S. M.', 1],
    ['Çiçek, Erdoğan & Fricke, Ronald & Eagderi, Soheil', 1],
    ['Other (1)', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);